It might be too little too late. Twitter made a lot of sense in 2010 when you only saw messages from the people you followed, and only discovered new people when those people specifically put their words into your stream. It was valuable, even if people were tweeting about their vacations and sandwiches.

App.net tried to launch a paid version of Twitter and it almost succeeded, but they weren't able to get a critical mass to convert all at once. Twitter was still more valuable as 8 out of 10 of your friends were still on Twitter, not App.

It has changed though. With more users and the new algorithmic timeline, If you are just starting out, you have no chance at getting good value out. Twitter decides what you see, whether you like it or not. It's like the TV from 1984 that is continuously bringing junk food into your living room. You don't get a remote, you only get a choice to have it, or not to have it in your house.

Twitter used to deliver unprecedented value 1:1, and now it extracts value from 100,000 and delivers it to 1. Unless you are the one, there is no sense in paying for it.