Hey Nick,
I hope my post is insightful, not demeaning.
You appear to have a specific (really low) CPA in mind while wanting 50 (high amount) leads a day. Without knowing your industry or target keywords, it's hard to comment on volume (leads) and CPA.
However, If you can generate 50 leads a day with certain keywords in PPC campaigns, then other people can too. If other people can, it drives up the price of your CPA. Thus, a low CPA and high number of leads is typically not reasonable.
I applaud you for tracking CPA and desiring a lot of leads. If you want 50 leads, assuming a 1% Click Through Rate and a 2% conversion on the clicks, you would need 2,500 clicks PER DAY and 250,000 impressions PER DAY. These are rough, industry standards but I hope this is insightful for what you're asking.
PS, Google doesn't call people trying to sale them. I second what Bruce said.
Thanks,
