Many pros go wrong, go bust, especially "followers" that play year 'round, as action/sendouts/greed/etc..grab 'em eventually. Also one-trick/niche pros, guys that rely on a sport for most of their yearly winnings get in bad spots at times, if for a spell, a year, or more.
Doesn't everyone know a Stu Ungar type or two?
I know someone that turned 12K into 380 in 7 months, then went back to 27 in a year, then back to 650 during the next 18 months, then to bust in two years.
It depends to what degree of "gambler" one is, as some wiseguys are selective even with tons of smart marks, and others are action-junkies.
As DPO said, if you haven't had one, you haven't been doing it long..even the best of the best have usually had to get a backer before..sometimes even BMs.
Remember Mike McD in Rounders, " Nobody asks what became of Rounders that took their shots, and missed, they wind up humping lousy jobs on graveyard shifts."..was based on thousands of true stories no doubt.
Kid named Steve(no, neither of those two Steves) in the LV streets back around '89 thru '93..outhouse to penthouse to outhouse then skipped.
As to the answer of the original question? In a word..Yes!