It's more likely that they would co-operate with phone operators, because companies like DaoPay take approximately 65% of your income.
Why can't a OT with a pretty big income do that also?
If more people start smsing/calling instead of paying via creditcard or paypal, they'll loose money on it.
EDIT: Unless they purchase a contract with the zaypay/daopay and pay them via monthly payment and get 100% of the donations that people pay them. Then it's another story, there is such companies but they are too expensive for open tibia but for companies like Tibia it's pretty good.
Wrong, the biggest part is going to the state (VAT) and the telefon companies. Thats the reason why you can get it so cheap and good service in Netherland etc, because the telefon company take alot less. Make the deals directly and you can make it quite good with them. But I seriously dobt tibia.com will get good deals in more then 10-15 countries too.
Why can't a OT with a pretty big income do that also?
I doubt a "big ot" gets enough money by donations to make it worth for dao pay to make such a deal.