Can anyone tell me how much these <a href="http://cgi.ebay.com.au/mag-wheels-to-suit-ford-falcon-15-inch_W0QQitemZ180005458738QQihZ008QQcategoryZ6782QQrdZ1QQcmdZViewItem#ebayphotohosting" target="_blank">wheels</a> are worth?

I'm looking to bid on them, but i'm not sure how high to go until it's not worth it.