I would pay per follow

Dear Seeking Alpha:  $20 per month is too much for your premium service, especially because I only follow one writer.  Your tools are the same or worse then 20 other websites'. Your writers vary wildly in quality - and half of them are just pushing their own for-pay service.  I'm not sure if you are a website of information or a website of ads.  Should I really pay $240 a year to look at boilerplate and ads?

Anyway it would be stupid for me to reduce my investment profits for a bunch of writers I don't care about. If you charged per follow I would pay you $1 per follow, meaning that I currently value your premium service at $12 per year (though now I'm wondering if I should trust you at all, or anyone who publishes on your website).