Everyone saying "this is a scam" needs to exchange the $10 for a brain; the point is not whether THIS exchange will work, the point is that, over all these money exchanges that don't work with Forex accurate exchanges (for example Paypal that can turn 1 euro into 1.4 dollars when it's worth 1.7 dollars, so exchange the other way around), there's bound to be two that give you a decent exchange rate difference.
If I "just think", I'll only realize that they make money of exchange fees and that the rest is earned by offering borderline-scam exchange rates (I'm looking at you, Paypal).
Similarly, you can find different betting sites which, after fees have been deducted, give you a 110% win rate. They don't lose because you aren't betting against them, but against other players (!) not aware of this exchange rate.
Betting site one offers 1.6 to 1 on a particular team, site two 1.4 to 1. Should you bet $100 on site one (to win $160), and $140 to win $100 on site two (counterbet), you'd either win $20 or break even (though obviously, you deduct the regular fee, so this particular example would be just below/above breaking even on average).
Do I have to spell it out or is this clear enough?
EDIT: additionally, most payment processors only charge in the range of 1.5%-5% fees, unlike the 9%+ most bookies do. This would make it a lot easier.
e.g. When the Euro was worth $1.78 dollars, Paypal turned 50 euros into 50 x 1.4 = $70.
Find a payment processor/poker site (protip) that transfers $50 into (x1.6) $80. Then transfer back the $80 with Paypal. $80/1.4 = 57 euros.
50 / 57 x 100% = 114%, netting you 15% over-all. (Which is basically 1.60/1.40, the exchange rates)
EDIT2: which is, in essence, more clever than depositing it, exchanging and waiting for the rate to change (which is what Forex traders do).