I would happily use AmigaOS4.1 on a Sam or X1000 alongside my classic Amigas running OS3, PCs running Aros and Efika running MorphOS, but I just can't afford it at all because I have no income. All my current hardware was pretty much given to me or found at a very good price, second hand. MorphOS users and developers were so appreciative of my interest to use and develop for MorphOS that I was given the Efika to use.
So I expect to be an AmigaOS4 user at some point, after I have come up with a way to start earning money online so I can stay at home and continue to learn how to develop Amiga software.
There are also things that OS4 does better than any other OS which I'm really looking forward to. It handles screen dragging better than OS3 and Aros (and MorphOS misses out on it completely), you can drag and drop files between screens in OS4! There are probably other good things about it too!
I don't see a problem with running multiple computers and OSs if you have enough room, which I guess I do. Variety is the spice of life they say, and OS4 would add some extra flavour if only I could afford to get it.