...it all turned very ugly, they reversed the chargeback and Paypal refused to give me my money back, they took out of my account.....
Well, just for the record, any customer can and will do a chargeback at any time for pretty much any reason, regardless of the payment processor.
PayPal gets a bad rap in part because many inexperienced small biz owners use it. But do a google search on "the square sucks" (or whatever payment processor you're interested in) before you decide PayPal is the only one with "issues".
Yes, the seller usually ends up on the wrong end of any bad payment incident, whether it's a bad check, CC chargeback, use of a stolen card, etc. After 12 years in business, I realize it's all part of the game, whether I like it or not.
Thankfully this kind of problem occurs in far less than 1% of my transactions, so I do my best to not let it sour my life too much.
I will also add, to respond to the OP's question, that I agree with the rest of the posters. Being able to swipe a CC = more money in my pocket, compared with taking only cash or checks. Be sure to practice with your card reader before crunch time, though -- learn how to swipe a card correctly and get familiar with the process so you don't get flustered at the show and make mistakes due to inexperience. --DeeAnna