Why is it a problem, now more people have access to the same exact game without paying crazy prices.
I agree, as long as they're clearly labeled and presented as reproductions. Most of these don't seem to be presented as reproductions so that's a problem.
I think what some collectors don't like is that this does reduce demand for the originals, and therefore reduces prices. Personally, I'm fine with that.
It's like when they re-printed the Akira comics/manga in trade paperback - the prices on the original issues went down, because some of the demand was from collectors who wanted mint-condition original run copies, but a good portion of the demand was from people who just wanted to read the damn things and were happy with nice, cheap TPBs.
If Sega finally releases Panzer Dragoon Saga for a new system, or even just an emulated version that runs on a modern system, the price for the original will drop. I'm sure it'll still be in demand on the basis of just being rare - but less so. People do silly shit for "rare" - I mean is Stadium Events for the NES a good game? Probably not, but it goes for stupid money.