Why is APM so expensive?

I've been doing some research on Alternative Payment Methods, or APMs, and I've noticed that they can be quite expensive compared to traditional payment methods like credit cards or bank transfers. Can you help me understand why that is? Are there any specific costs associated with APMs that drive up the price? Is it because they offer more convenience or flexibility than other payment options? Or is there something else going on that I'm missing? I'd really appreciate your insights on this topic.