No one should pay a markup on these, whether from ebay or somewhere else. They will be readily available for cheap in a few months anyway when those who rushed to buy them because of price gets bored of WebOS or tired of waiting for an Android port that may never come (or end ups too buggy).
Although the ebay "asstrepeneurs" are within their rights to make a buck, I can't believe people are paying over $250 for these. As far as ditching it because I tire of WebOs or can't get a port, I think that is a bit presumptuous. I bought a few for the family and I am quite pleased. Even without an Android port or continued WebOs development, these were hands-down the best deal available. For a fraction of the cost of anything else, it has provided a lot of features. Most notable for me:
Kindle
Web Browser tablet
Video player with very good quality
MP3 player
Video skype with the family (we all have one)
Any one or two of those features make this worth the $99, so don;t assume these are going to be ditched in droves. Hell, for $99, I can hand this to my kid full of movies and not hear from them for hours...
That said, I would absolutely love to get Netflix on this thing. As for mine, when there is a decent Android port, I will definitely give that a shot. Maybe someone will pick up the WebOs torch or HP will dump it to the community. It isn't bad at all, just not worth a $400+ premium.
EH