Two things:
1. Why does it cost 49cents to place a 1cent bid?
2. Why isn't CRX the default bid currency?
What I believe will happen when the crx currency processor will be live is:
the 10% discount on bids for other coins will disapear and we will see a 20% discount on bids purchased using CRX
Also CRX is what you need to hold in order to take part in the revenue sharing of the penny auction website.