I truly think that there is a market for a collector's package. If the regular one is only a few bucks to make and send, and you can up it to $50, why not go for a $75-$85 tier (or add to the $100 tier) with a collector's boxed copy? A nice CD soundtrack, a cool looking box and an official Xenonauts mousepad would be great items to bundle in! I am certain you would sell enough to justify it! If you want to make sure it sells then make it a hand-numbered limited edition (numbered up to 100 or even 250). Why not do a poll to see what the interest level is?