We both have the same reasoning for the high minimum cashout via international checks. Very high fees banks charge accross the globe that just eat all your earnings for one. And the manual work it requires to send out all the checks.
For example I deposited an USD check back in 22nd December and they already took €26 (not €20 as I mentioned earlier) from my balance to cover their expenses before the money is even available! Which it isn't yet btw, will probably need a couple more weeks!
In other words checks are really bad
Electronic payments are preferred (AlertPay, PayPal).