Whats the problem about recieving offers first? If you want to let it go to a fan I first ask at a forum of the fans.. you can talk about everything.. even the price! If you dont get to a good result for both then its eBay.. out of eBay is best for both tough! The seller doesnt need to pay the damn high eBay fees.
I´m not selfish at all.. if you would know me you would know that!
And "as a serious collector" I mean - she wouldnt be sad about my offer! I know what these things could go for and I offer that. She might have been ended up better that way.
I would trust your offer, I know you know how valuable things are. But I know that because I'm a frequent member of GDC. Other people who only stop by occasionally and don't really sell stuff - don't know that. So I can absolutely understand why to someone else they wouldn't want to risk getting ripped off by someone giving them a low value for something they might sell higher in an auction.
Here's the second part. Some people don't mind taking offers or making a deal with someone. Other people don't want to do that. They don't want 3 or 4 people sending them messages each offering a price, then the seller trying to negotiate. That's just not fun for some people, so it's easier to throw it up on eBay.