Having been in the merchant services processing business for many years I have noticed that most merchant services providers tend to jack up their customers merchant processing fees after about one year of service. In the cases where a merchant services provider sells a customer at a price that is unprofitable in order to get a deal they usually do a massive price increase about 2 months after a contract is signed.
This leads me to the conclusion that most merchant services providers are not a trusted partner. Unless you are partnered with a company like Choice Merchant Services you should expect large pricing increases without warning. Make sure you check your statements every month to make sure your merchant services provider is not trying to take advantage of you.