VB,
I don't know where he gets that 50% estimate as it seems rather high.
HOWEVER (you knew that was coming), I do think a much higher proportion of the ex-pat community is at least figuratively on the run from something than would be the case in the typical group of people back in the states.
MOST are here, as you are, simply to enjoy an affordable retirement in a tropical "paradise".
MANY are here as legitimate businessmen, such as Admin1. But, you must admit, a fair number are on the run from the law or from creditors or to escape or save bad marriages/relationships or from drinking problems or from simply the inability to fit in at home. Even if it wasn't obvious this guy was a criminal on the run, the warning signs were there that he at least had a gambling problem. Some are even here because they've been banned from the casinos back in the states

. The ones that come here to escape rather than to find something very often find they merely bring their problems with them. The ones that don't think it through before they come are the ones that discover they've traded one set of problems for another.
Most of these types either adjust or eventually return home (voluntarily or, as in this case, in cuffs). But, far too often, many ex-pats end up coping or continuing with those problems (whether imported or domestic) in less than socially desirable ways. How many turn to drink once they're here? Or just ask Admin1 about
OTHER Gringo expats (not him of course) pitching "free" RE advice that ends up costing you. We've all run into those guys at various times. And, YES, some even appear on this board. I won't mention names, but lets just say if you always carry a personal supply of licqour on you, you just MIGHT have a drinking problem.
My point is that while its hard to give it an exact percentage, the problems certainly exist. I know you've made similar observations yourself before.