I didn't renew my App.net subscription, there really was no value for me. Checking it along with Twitter got tiresome (I was hoping someone would integrate the two into a single client) and overall everyone I care to follow is on Twitter, it was difficult to get people interested and on the App.net bandwagon.
> I was hoping someone would integrate the two into a single client
My belief is that Twitter's rules prohibited doing precisely that. There are multiple developers that expressed an interest in creating a single app for viewing both, but never did so because Twitter would have revoked their API token.