Any decent sized online book has a 20k telecomunications cost (fixed cost) before they take a bet. Any business working on margins of less than 5% would have one helluva a time making it in the States with normal telecommunication costs let alone in Costa Rica, Jamaica, or Dominican Republic where those costs are absurd and the service mediocre at best. Throw that in with the other costs Dannymay mentioned plus CHARGEBACKS/SCAMS/BONUS WHORES etc. and its tough to break even let alone earn.