You've paid what you considered to be a fair price for it. If it turns out to have an unusual alignment then you have redress through Ebay and Paypal to get your funds back and leave negative feedback as a warning to others.
If it's straight then you've got exactly what you paid for.
As for flipping stuff that you bought on here, that's an even more contentious subject than "what is retro" or "what is a mountain bike evolutionary dead end".
That's what I thought, with the exception of a few that were actually built in the UK and US, a lot of frames were made in Taiwan for UK and US brands in the 90s, I know that Marin frames were. I also thought that if it's made from Tange Prestige, it can't be all that bad, you wouldn't use such an expensive tube set to build a lousy frame.
In any case, I guess I'll have to wait until it arrives, build it up and see how it rides. It'll be interesting to get it on the scales and see how it compares to my Marin frame as well.
If someone is willing to pay a certain price to secure an item on eBay then they shouldn't really be;
A: Questioning the value/validity/wisdom of their purchase on an open forum
or
B: Questioning the integrity of a respected member of said forum just because their purchase isn't everyones cup of tea... :?
FWIW I like the frame; if it was mine I'd take an angle grinder to the mounts on the rear drop outs, get it powder coated and do a contrasting build - say flouro' yellow frame with black components!
Or replicate the original look, which reminds me of a Rock Lobster...