i imagine they're trying to target dealers rather than addicts or occasional recreational users, though the possession is just as illegal (well, plus "intent to distribute", yea yea yea)... it wouldn't be worth their time to locate someone who
might have something, but had probably taken it by the time they get there
someone who's here looking for help, like if they say "i have a good supply of xxxx right now and am struggling to not do it but can't get rid of it, need the comfort of having the stash just in case...." that kind of thing..... that'd be such a dick move to try and bust someone for that, and wouldnt it just go thru court where, when presented with evidence that's really a cry for help, they'd most likely just get sent to rehab anyway?
unless you're trying to get customers over the internet there shouldn't be reason to advertise large quantities of anything in your possession. if you're doing that enough to call that much attention to yourself, you'll get the attention you want all right...
this is my guess, im not saying anything is actually how it is, it's just what seems logical to me but i've never heard for sure...