Normally when you claim something and someone counters that claim, you're supposed address the counter-claim, not repeat yourself.
Maybe you just don't understand the concept behind cost-benefit (don't worry, a lot of people don't), but I'm only going to counter your claim one more time. If you want to keep repeating yourself again, I'm not going to respond ok?
Yes, CC fees play a role in determining price and/or markup of a product and yes, some cards charge 4-5% in fees, however:
1) Since nobody knows what card a customer will pull out, markups on determined on *average fees* which is around 2-3%.
2) Credit Cards increase revenue. Since they are a variable cost and overhead is mostly fixed, the increased revenue = more profit.
3) Price determination is NOT cost alone, profit targets are also a consideration. Whatever losses are incurred by CC fees, is offset by the increase they bring to the table in profit (see point 2).
In conclusion, credit-cards have a tremendous cost benefit and whatever cost they have on the bottom line is offset by the increase in revenue and thereby profits.
Their overall impact on price is therefore not material.