I think the rack/support thing is way too overrated. It shouldn't cost as much as it does, and the claims the manufacturers make are absurd.
I will never argue with turntable support.
But amp stands? Come on. As long as its strong enough to hold the equipment, sturdy enough to not fall over, and allows adequate ventillation, there's no need to get caught up in what these guys (the manufacturers) are slinging.
Everyone has the right to buy what they want. I'm not one of these guys who's going to tell you you spent too much money on snake oil like those anti-cables guys. Everyone hears what they here, but I wouldn't equate a rack with sound quality.
Except turntable support.
I want to say it makes a difference with CD players, but I'm pretty skeptical about the support's role in those too.