Earlier quoted context omitted.
are you certain that they aren't figuring in costs and billing you for $10+rates? while that would mean the end customer pays more, it does mean they would be getting more than a paypal donation.
Well, think that one through: if your advertisement says "Text 12345 to 45678 to donate $10 to the Red Cross", and you do so, and then your itemized cellphone bill says "Red Cross: $20", what is your reaction likely to be? Merchants foot the bill for transaction costs to encourage transaction volume. It is the same reason I quote my prices as $29.95 not "$29.95 plus whatever your credit card costs me to process."
edit: http://twitter.com/RedCross/status/7720590281 edit2: beatten