he's had this happen a few years ago..
imo, what happens is that the cc processor finds out he's selling cannabis seeds, and they revoke his processing abilities.. this i why a lot of smaller banks you'll notice that they don't accept cc's.. they're not trying to be dicks, it's the simple fact that cannabis business is pretty much considered the drug trade, and no cc processing co is willing to process cards for the drug trade..
when he did start processing cards again, you notice that it went through some shop, it was sannies, but it wasn't sannies seed shop if you ever noticed.. this is how he was getting around it for this long.. looks like the processing co. caught on again and put an end to it.. doesn't mean it's the eqnd of the world as there's always a chance that he will find another co. to do his processing.. it's not easy finding a new co. from what i've seen though, so it could take some time.. i forget how long he wasn't accepting them the last time..
and lastly, if you want to cut out scammers, simply require every order to be sent traced, that way someone just can't say the money showed up when the tracking says it hasn't... really is that easy.. if tracking says it never showed up, you don't mail out the beans, no confrontation required..