Why 2000 Twitter?

Interesting issue with Twitter right now – they do not allow you to follow more than 2000 (or a gap between following and followers). Is this a performance issue to get rid of the whales?

Personally I use my twitter feed as a newsfeed. I can find out what a large number of people are thinking about the issue of the day. There really isn’t another way to do that right now easily, so the following no more than 2000 people really impacts me.

I could understand this if it was a performance issue – but then simply tell people that it is a performance issue.

As it is, i feel bad as people follow me and I cannot return the favor. I suspect its time to get rid of the worst type of twitterati, the follow you for a day and then drop you (so they gain followers and reduce following).