You should post a link to the ebay listing here in this thread, in case anyone is interested. Good luck!
I would think that $250 is a pretty fair price. The $450 seems high to me though.
I'd say another part of the problem is that you've only got it for local pickup only. That's understandable though, as I'm sure it would cost a lot to ship that thing. I only live 10-15 minutes from you, but I'm not too big a fan of benjamina
In this part of the country though, where tropical stock is harder to come by, I'm sure you'll find someone.
It looks like a super easy tree to ship. Nothing there to complicate matters. It appears as though an 18"x18"x24" box would suffice. if its shipping weight is 45 lbs then its probably about $51 via Fedex to most places.
So, I would not let shipping restrict your pool of potential purchasers.