It doesnt hurt to add some seo stuff to free sites and galleries.

Basically, you are submitting and forgetting them, getting an initial burst of traffic from the site you have submitted to but after that, typically you are not going to get much long-term residual traffic after the first month of submission.

By adding some basic SEO stuff to your galleries and free sites you will be helping to increase the amount of residual traffic you receive and if you are good at SEO you should be able to get some pretty decent organic search engine traffic to your sponsors

Regards,

Lee