The bottom line is that the seller set the terms, you agreed to them when you bid on the item (and won it), and now you want to change the rules to suit you. I'm glad it all worked out, but the seller was not in the wrong to want to stick to the terms he stated up front. Certain sellers want things done a specific way, and if you want to buy from them then you need to agree otherwise you're better off spending your money elsewhere.
I buy about half of the guns I purchase FTF, and usually at some public location during the daytime. I have had a few sellers that want me to meet them at their homes, I wouldn't do that but I guess they trust people enough that it doesn't bother them. But I am not paranoid about meeting people, and I have yet to hear of anyone being robbed during a gun purchase (well, in the traditional sense. Getting ripped off due to a bad deal is something else).
I also buy a lot of guns online, many through auction sites and I've had nothing but positive experiences to date. I occasionally read about bad deals but for the most part I think it is a good way to find and acquire firearms.
The bottom line is if you and the seller can't agree to the terms of the sale, then either of you have the right to walk away. Don't expect that because you want things done one way that the seller has to agree to them, it is a free market system and no one has to conduct a deal they are not 100% satisfied with!
Learn from this experience and move on...
Merry Christmas! M2