lol.. truu. it was probably a fairly informative jacking
i'm not sure if you could run 50 psi without using alcohol. but, i would agree, in situations where you're running very high boost in a racing environment, intercooling and water injection would probably be a killer setup.
or, if you're drag racing, you can just use nitrous, it works a hell of a lot better than water injection
and actually, you could make the high-psi system live streetable, if you're careful. at least, on a turbo car. you could install an electronically controlled wastegate. set it at a fairly conservative number, say 8-10psi for the street, and when you want to race, you could kick in the water injection and jack up the boost to 14 or so. this would keep a pretty reliable car, and still have that extra fun when you want to race.
this is, of course assuming you're already using an intercooler
although, to me, i think the intercooler would be a good sales tool. the benefit to the customer is a cooler running engine, and more power more reliably. things they like to hear
but i'm very glad i don't sell cars anymore.
so, for the first post, install an intercooler and your car will be much happier