mostly for electronic trading on eBay. Am aware of the possibilities for grief - which is why I rely upon the buyer/seller's feedback rating, the immediacy and tone of e-mail exchanges, etc. I don't Have to complete a deal I find fishy in any way. A couple I've aborted.
So far so good. I haven't been ripped-off yet, in >100 transactions over the years. YMMV.
The alternative (re eBay anyway) is to use one of their captive services, BidPoint or some such. But PP was first. I deem eBay as going the way of Billy (with whom they are in bed) et al.. terminal greed + ever-increasing toy frills: which are rendering the site more and more cluttered with gew-gaws. They are also very hard to contact by phone; a litmus for future skullduggery IMhO. I expect I'll peddle quite fewer scopes, etc. in future. Life too short..
I'd guess that one's paranoia about PP can be mollified by: minimizing any chances that the buyer/seller might suffer buyer's remorse or other I am not responsible for my actions adolescent behavior. A way too high or low price is an indication of such possibilities.
Ashton