NoFollow Links from Subdomain to root domain better than DoFollow Links?

[Sebastian23]

Our service at fotograf.de is a shopsystem for professional photographers. The customers can build their own website with our tool including an onlineshop to sell their pictures.

Here is my question:

One part of the customers use subdomains of our site like photographers.fotograf.de. On each customer website we include a backlink to our homepage www.fotograf.de.

From SEO view is it better to set these links as NoFollow Links?

Or should we put one Follow Link on the starting page on each site and on the other pages only NoFollow Link?

Are these links bad for our SEO regarding link diversity because they all come from one root domain?

Thanks for the answers!

Sebastian

[kadesmith]

Are these site wide footer links on the subdomain site?  If yes, they probably aren't helping you much at all if they are DoFollow or NoFollow.

[Sebastian23]

Yes, the links are site wide. Would it be better to set only 1 link on each site?

[kadesmith]

I can't say that it would be better or just the same.  I know that I would definitely try it and see what happens.  That's a lot of SEO, trying things out see what happens.  If it works, continue down the path, if it doesn't change course.