How much of a factor were the client limit and the API changes? I'd like to better understand if this is just you moving on or if twitter has made it impossible to continue your app.
I remember when I was on honeymoon and my web host fired me an email about blocking internet access because I was overloading their DNS server. I explained my situation (hey it's a production site and I'm away on vacation) and requested for them to keep me up for 4 more days when I'll be back home. They refused and I had to worked on it at the hotel, while my newly-wedded wife waited. I remember when I woke up in the night 2-5am, doing support, replying to users. I was fanatic about supporting users well.
I loved what I did. But that love has waned. Why stay when you aren't welcome?