Thrifty Pig

I received a 5-page "exclusive, special invitation" letter in the mail for thriftypig.com, apparently a new survey site. The deadline to sign up is Dec 7th, and if I miss it, my "chance will be gone forever". I can't find any info online about it. Google search listing says "No information is available for this page." I'm too apprehensive to go to the actual site.

My gut says "shady", but I was just wondering if anyone here knows anything.