I don't want to answer for Martin, but I agrre with what he says.
Before upgrading to an Iyonix, I was using a Select SA RiscPC and browsing with Fresco. Increasingly I found myself frustrated by not being able to do things, so I would use Windows instead.
Now I've upgraded to an Iyonix and I hardly use the PC at all. Browsing is faster (with a better network card) and more pleasant (Oregano2 is bundled for free), I can use my USB pen drive to transfer stuff to work, compiling programs no longer takes ages, the machine starts up quicker (Select on a RPC was slower than WinXP). On the RiscPC I *could* use a flashy jpeg backdrop, play MP3s and listen to internet radio stations, but not without compromising on the speed of other operations. On an Iyonix you don't have to think about these things.
So it's not so much that things *can't* be done on a RiscPC (although often with extra expense), but that the user experience makes it seem like a Windows PC is a better option in comparison. This isn't true with an Iyonix.
That's just my experience, anyway. Probably those who have bought emulated devices experience something similar.