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It works for some of the largest companies in the world. You're telling people that you're a legit company with nothing to hide.
Use it as a CTA and test it out!
Zappos:
name="description" content="Free shipping BOTH ways on shoes, clothing, and more! 365-day return policy, over 1000 brands, 24/7 friendly customer service. 1-800-927-7671" />
I agree w/ AWC.
If you do watermark, just make sure it's not the least bit distracting.
One ecomm site I work with has over 10,000 original product images. They were constantly being stolen, which is annoying considering the effort that goes into the production of the images. Once they were watermarked (via the ecomm platform), the poaching pretty much stopped.
Are you checking your data quality feedback in the merchant center?
Are you missing any of the "R" fields in the required attributes?
https://support.google.com/merchants/answer/1344057
Also check out the PLA Guide on PPC Hero
What do you mean by pointing them to your main site (linking or redirecting)?
And if your concern is just because you have the inventory of domain names, shut 'em down if the sites are of no value.
Yep, there are risks:
Suggestions if you don't want to do the whole lot:
SE Crawlers are not logged in and will encounter the '302'. So no flow of "link juice" will be passed.
What are "results"?
Are you willing to turn over your entire site to the "SEO provider"? If not, it's truly difficult to pay for results.
It's a two-way street; your SEO firm can only be effective if you're doing your part. The days of paying a company to "go out and do some SEO" are long gone.
At this point, I'd only adjust 301's for the pages actual users are trying to access and pages with good backlinks.
Google will always have a record of the old pages in WMT, don't fret over that.
Does your competition have more content for these products?
If so, you need to ramp it up.
Either way, no-indexing them is not going to do any good.
If the structure of the URL's make sense, I wouldn't worry about it.
But if,
carsdepots.com/birmingham-cars/cars
is really just
carsdepots.com/birmingham-cars,
then I'd think about addressing it.
This is getting old, guys!
I've got nothing but respect for MOZ but it definitely seems like you bit off more than you can chew.
I can't think of one Moz "tool" or service right now that is 100% reliable.
$100/month isn't going to break the bank for most people....but it's an expense. It's actually more $ than I pay for my 400 sq. ft. office's internet service and electricity combined. And they're always on. 
This can be tricky! Which platform are you on?
Something I've had to deal with quite a bit and there's no single solution for all types of products.
Ideally, you'd like to offer all of the sizes on a single page, assuming everything else is the same. So if I search "clear vinyl tubing", I'd rather see a listing result that says something like "Clear Vinyl Tubing - Various Diameters" versus a whole page of identical product listings and having to scan for the size.
If your tubing is offered in different lengths, it might better to have a listing for each diameter and have the length selectable.
Think of apparel products; they allow you to select colors and sizes.
But in general, the platform and way you have things set up on the backend might dictate the best way to do this.
Keep in mind product feeds (e.g., Google shopping), and make sure you can list and possibly redirect the variants correctly.
(note: make sure the individual SKU's and/or MPN's are searchable)
"...a combination of operating system, location, and some other factors can do the trick."
Yep, combined with those, look for "Avg. Time on Page = 00:00:00"
Do you have the Analytics Tag Assistant for Chrome? That can help you verify analytics is set up and working properly.
Check out topic from a few months ago-
http://moz.com/community/q/ecommerce-problem-with-canonicol-rel-next-rel-prev
How old is the site?
In my experience, I've found it best to first see how things are actually being indexed, which pages are showing up in SERPS, and what the user behavior is.
Is being #1 bringing in traffic and $? If so, Takeshi's answer below might be worth looking into. The only problem with "If it aint broke don't fix it.", is that once it's broke, you're left w/ nothing....or worse.
REI and Cabela's do a nice job.
This Mozinar from last year is really good-
I suppose this depends on the type of business.
As you know, $300 wont get much. If local SEO is relevant to the business, I'd go that route.
Otherwise, you're dealing with a company who is not sold on the value of SEO. And do you really want to deal w/ that?
In this case, especially, usability = SEO. Mobile for restaurants is extremely important. People like to use the sitelinks to go directly to a menu or directions.
Sounds like you're aware of Google's stance on the subject.
I'm not familiar w/ SinglePlatform- but I'd think they are addressing or will have to address this soon.