Not every, just most. The time I saw this used, I was quite interested to learn of the concept (as an entrepreneur admiring the idea) and find out about the band being promoted.
I've seen it once, which is a lot less than I've seen people checking in with Foursquare stuff which is excruciatingly boring.
You could use an account with no real followers.
Re:Pay With A Tweet
by whatusername on Tuesday October 05, 2010 @11:54AM
(#1760190)
Just like we all have something like a fake/spam email address (that we give out to the sites we don't care about) -- we'll end up with fake twitter accounts.
Also - can't we just filter this out from a client?
And a loss for every follower of the "payer".