I know a lot of people who would love to try mac, but balk at its lack of options and perceived lesser value hardware wise compared with pc's. Heck, I'm going to be sending them the link.
These same people have an aversion to apple's current product line and price points. They smirk at mini's, poo poo the graphics cards in iMacs and gasp at the cost of the Mac Pro. They're not going to be running to the apple store anytime soon. How would these people buying this system cannibalize mac sales?
These same people would be buying software and supporting developers for the mac platform. Again, how is that bad for Apple? I think Apple should sell them copies of 10.4 for their machines and contractually obligate them to keep leopard off of them.
People who value style, design and simplicity (stuff working right out of the box) will continue to buy macs from the apple store and et cetera. If apple cracks down hard on this company, I think it will be to its detriment. IMHO.