Why should he care about suggestions from people who use his pool?  Besides "make the website prettier" what suggestions do most people have to offer?  Are they going to develop a new algorithm to increase payouts?  If so, he is probably interested in that, but if someone had the ability to better his algorithms then they probably are a pool operator themselves.

As for concerns... what concerns do you think that could be brought up that h2o is not aware of?

I swear some people just think he is sitting in penthouse suite in Vegas doing lines of coke off strippers asses while collecting all these fees.  He isn't running the most successful (to-date) auto-exchanging pool by just sitting on his ass.  He gets shit done and it's obvious because the pool is still standing and still competing for the title of most profitable pool.