This is an interesting proposition but I'm concerned that the Bitcoin community (as it stands) and the sports community don't overlap to any significant degree. Dice and casinos are one thing but geeks and jocks typically don't jive. Assuming the site is developed and everything is a go, where do you plan on getting these members from? An online sig banner ad campaign? Considering it is unique, I do see promise for this at some point assuming all goes right. The fact that you value your reputation is a big one for me in terms of considering throwing down.
I know what you say. This is why (it's also written in the doc), when the site is ready members can sign up also with paying with USD (traditional payment methods).
As far as what I intend to do after the development process is finished, here's a quick summary (beside these of course the site will be SEO optimized, but with today's Google algrorythm being so unpredictable there is no guarantee regarding to good rankings for top keywords):
- viral marketing (FB, Twitter, etc); people will be able to share, like, tweet (or the system will share, like, tweet automatically instead of them, if they will choose to login for example via FB, or they accept this)
- Youtube videos: it is a strong way to build up confidence because you can showcase in short videos successes, every days prediction success ratio, funny videos about it, etc.
- Using forums, like bitcointalk for example, and marketing there the existence of this website; but also on more specialized forums, related to sports and sports betting
- Affiliate/Tell a friend systems of course, which will help spreading the word (or other type of reward systems)
- building an email list (and thinking on other email marketing campaigns, like partnering up with existing lists and offering affiliate programs, etc.; have some connections in this field as I have been involved in creating lots of gambling related websites)
It's not a final plan, nor perfect, but it's a start for what I intend to do to make this system popular.