The cost of convenience

I paid my house note online. I'd talked to the mortgage company, found out that was available. Hooray, convenience, and I can pay the day before it's due instead of having to allow time for the mail to get there. Well, I went through the process of registering and all, and got ready to make my payment. They neglected to tell me there's a $9.95 fee for the convenience of using the online payment service. That sucks. Like they aren't getting enough money from me already on interest.