600 is insane for any baby item! That adds up to over 900 US dollars!! I paid $60 USD (that's £36) for my son's and daughters strollers and only $100 USD (£61) for their cribs. The baby is going to ruin it anyway (most likely by peeing, pooping, and smushing food in it) so spending a bunch of money on it is just pouring money down the drain.
Why is it insane if you can afford it, and have that disposable income available? A friend of mine spend £4,000 on her nursery. No, it's not something I would do but I wouldn't automatically say she was nuts for doing it. It's her money, and if she can afford it then why now?
Babies also don't tend to ruin things through use. Things like prams, highchairs, etc are made with heavy duty wipe clean material to avoid it being ruined. Maybe the cheaper brands aren't as hard wearing or something.