Hi, perhaps someone with more Ebay experience than me can advise me. Be aware that I am crime-paranoid and capable of over-reaction at the mere sight of a crowbar and sports bag. 
I sold an easy-sell item yesterday for £70ish, this morning the local buyer asked if she could collect in person. I said of course, happy to arrange if payment made through Ebay, and sent an invoice without any P&P.
She didn't pay and asked me for my address so her partner who she says works locally could collect it. I said OK, gave a bit of the address, asked for exact time of collection and for payment. She didn't pay and asked for the postcode. I basically ignored the postcode request and said 'yeah, we're difficult to find. Please can you arrange payment?' She still hasn't paid.
It felt teeny bit dodgy from the start TBH. If I had hot cash that I wanted to turn into easy-sell non-suspicious stuff, I'd look for easy-sell items that were local, go and pick them up and try to pay in cash. Then sell non-dodge legit items in my Ebay shop, pay fees/tax/whevs and - hey presto - clean cash in an account.
Am I being OTT? You can tell me straight. 