I understood all those points.

Here's my rebuttal,

Twitter actually does generate revenue for Celebrities. Individuals with a large following like Bella or Kim get rewarded very well for promoting a product/service: http://www.huffingtonpost.com/2012/01/29/kim-kardashian-snoop-dogg_n_1240339.html

10,000 a tweet for Kim (back in 2012), and could be more today.

I don't know about you, but I have yet to see anything exclusive, yet. I know it's coming, but I haven't seen anything that would be considered this. Maybe the "write my name on a paper" requests, but that only feeds the ego of the few who get their requests answered. Exclusive should be an upcoming song, trailer, video, etc.

Bella is the only one rocking it with the chat sessions at specified times.

100%, I do agree that it will get bigger, but like I stated earlier, they will need to find ways to bring the audience back on a consistent basis.

This could simple be, having a large celebrity base and have at least 2-3 of them doing live chat sessions a week.