An estimate:
1.5 million metro area residents. 600K males of pooning age. 0.1% of them pooning on a given day (6,000). $150 average fee. $900 million spent by locals daily.
Add to that, maybe another 1,000 out-of-town visitors @ $180 (I'm assuming that they pay a little more, and you get $1.08 million.
Over a year that's more than $390 million. A lot less than the cannabis industry, but still impressive.
If the gov't. legalized and oversaw it, what a nice revenue source.
(Lots of estimates and assumptions here, of course.)