It's a pity about legacy hardware. I have the UAE Amiga on my Mac but it's a bit glitchy and sometimes I can't control the games. I wish they would legally open up the ROMs and allow the old games to be freeware as it's difficult to nigh on impossible to get hold of those gems any more.
I own an Amiga 500 (first computer) that still works well, but it's locked up in a cupboard most of the time. There is a way of getting the boot ROM off the Amiga itself but I don't fancy the hassle of trying to connect my Amiga (which has not really been used since 1995) to the internet or anything like that. Networking with Mac OS X is probably possible but my Amiga has no hard drive, USB ports, ethernet ports or CD drive and is armed with just a floppy drive, which is one thing my Mac and Dell don't have! Not to mention the non-readable Amiga file format system!
I managed to get my ROM from some site (just google search it), which was legal for me because I own an Amiga. However, since you can no longer buy these old machines, then there is no longer a way of legally purchasing them (apart from old antique stores!) so I don't think there is much harm in nabbing them anyway. Like I say, I wish everyone would open the old systems up, like what has happened with the Sinclair Spectrum, and especially now Commodore has gone bust.
No-one should stop you from playing Amiga classics!!