Payment processing is a complicated industry, and most businesses don't know much about how it works when they start out. When there's so much to learn, it's hard to blame them. Most don't gain what limited understand they have until they've set up shop and partnered with an ISO to use a particular gateway for their business.

The problem with it is, in their limited understanding, callow businesses might partner with a provider that neither meets their needs nor gives them a fair price for services. Anyone who runs an eCommerce business needs to be aware of the options when it comes to payment gateways, and some may be a better fit for your business than others.