I have yet to start my eCommerce business as my country is not accepted by any payment processors, so I plan to open a company in a different country. I am scared that I will go through all that trouble, make 10-100 sales, and one unreasonable person will chargeback through their bank and I am done for it.

Are you telling me that Visa/Mastercard think that, on average, there is not even 1 "difficult" person in 100 who will lie about receiving product/quality/advertising just to get their money back?I could offer the best service in the world and, probably, there would still be 2+ people who will make a fuss for the sake of it.

I'm not able to find an answer to my question. I hope I understand this incorrectly.