I make a pretty penny designing polls and other landing pages for my clients. Polls are mostly effective on the 'less educated' and 'younger' demographics because most people worth their weight in anything know that it's just a pre-sell on someone's service (usually a scamming affiliate deal for ring tones or acai berry diet pills--which still makes some people millionaires).

Sure, you can create a gimmick similar to this one, but eventually people will want to see the real meat that tells them you can be trusted. If you want sign-ups there are definitely better ways on a per-hour or per-dollar invested basis. But it can be fun every once in a while. Just be careful it won't cut some of your reputation as a worthwhile company away.