One of my biggest turn offs is people that want to do in person deals because most of them end up being fruitcakes. I don't mean to offend here so for clarity it is important here on out for everyone to know that I am using the collective "you" below based on my experiences:
We have been living in the ebay age for 20 years now. And while ebay is no longer the go to site for gear, the whole point is that most gear commerce is transacted on the web so go there because that is where all the good gear is and that is where all the good deals are.
If you have the savvy to list your bass on a website, and you have the savvy to source you gear on a website, you have the savvy to complete a transaction through a website and ship via a courier.
As a seller, I meticulously and painstakingly describe my basses and back up my verbose listings with ample and detailed pictures. And I pack better than most so called pros (check my feedback). And as a buyer I have a bunch of standard questions to weed out bad listings. And most importantly I quickly learned how to spot a chump seller in no time flat.
Of the in person offers I have entertained, about half the folks who agreed to a specific date and time to meet up just plain flaked the day of. Since I always email the morning of a meet, I got responses saying "I can't do it " or "changed my mind." They day of. ANd I can almost guarantee you that if I didn't check in I would have showed up and they would not have. Of the other half that did show up, half of them were freaks. The other half were great.
Those are not good numbers if you are are a normal human being trying to transact gear trades in person.
I have since refined my Q and A to try to weed out nut jobs from in person meets but the fact is that many people, let alone musicians, are total flakes.
So whatever this great deal was, you can find another one online. Figure out what you need to ask the seller to vet its legitimacy. If you just must play it first, figure out where to find one to do that too. But if you cannot play it first, but you can vet out that what you are getting is is legit, and you don't like it, you can sell it and get most of your money out. That is the beauty of the internet.
Just my experience here. Based on a couple a LOT of transactions. YMMV.