It's more about occasional players not buying it, guys who don't want to "deal" with playing in Boston and answering to mass media and rabid fandom.
I can't think of too many prospects who crumbled from the spotlight, probably because they don't last too long if they fail, but it's more veterans who accept big money but then try to shun the attention that comes with it. That list is easy to make: Price, Crawford, Pablo, AGon, Renteria, etc. etc.
I wouldn't include Rusney, who wanted to play in Boston but wasn't allowed to because they paid him too much.