> "We've been seeing click through of 5-20X times higher..." hey that's great :-) I think that monitoring, A/B split tests and continually pondering on the data to find out how you get better click throughs is paramount to your business, after all that's where the money is. And without money there is no business...

> "About the relevancy of ads we serve" - I missed that one ;-) But I think that it is definitely the right decision to focus on what you do well, and do only that. Especially if you are only one founder and thus have limited resources.

A word about patents. I have done two startups, both based on patents I have. One of the things I would have done differently is to not focus so much on the technology that we happened to have a patent on, but go where the market leads. It is easy to become thrilled by a patent, but in my experience the only ones that care about it are investors. It's a great thing to have, but don't base your business on it. Just saying this because I noticed you mentioned it a few times in the comments.