Well I looked at it this way.
1. I could find the service manuals.
2. I would have two, so if their was hard to find parts bad in one, I should be able to salvage from the second.
3. If I was foolish enough to buy them, if all else failed, hopefully someone else would and I turn around and re-list.
I had people bidding against me, so I should have been able to get most of my money out of them should I flip them back on ebay. Now that they work, I could turn around and sell them for a profit.
So assuming your smart about it, I don't think your risking too much.