> Even if it's some hilariously high number (eg. 50%)
It's plausibly even higher than that. The incentive for civil asset forfeitures is for law enforcement to seize in exactly this sort of "a medium amount of money from a large number of people" type of situation. Because it makes this useless:
> Also in theory civil forfeitures can be recovered
"I got back my $9000 and all I had to do was pay $25,000 to a lawyer."
And when people do the math on that and decide not to pursue it, law enforcement gets to keep the money. Hence the incentive for them to do it.