The claim people are making here is that they are sure paycoin is a scam, sure enough to write over 500 pages on it and expose themself to considerable ridicule if it isn't. That requires a great deal of confidence. I've had people tell me in irc that there a "99% chance" that paycoin is bust in a week. The claim I'm betting for (that paycoin won't go bust) does not have to hold a high confidence to act on it. If I have a >50% probability in that, then buying paycoin for $10 in hopes of getting $20 is justified. To bet, I need a better incentive than doubling my money.

That's the reason the odds are better for me: it's against the market. In order to bet at even odds, people would have to believe that there's a 50% chance that paycoin isn't a scam. From the tone of people here, they're not ready to put that at 50%, but they might put it at 10% or less. That's why I chose that number.

All bets are determined by what people are willing to risk for it.