How much typo traffic do you get? There is no developed site at customize () com so I don't think you get any. If your traffic is zero or really low it is reg-fee.
Nil value as a typo domain, seriously not a very likely one. I do however think that it has brilliant potential as modification or template site for the plethora of scripts that are out there, it would make a good tag!
$5 in my opinion. Because it is a typo whose original version is Customize.com which in itself has no traffic, so no chance your Typo will get any traffic from Typing errors.