Not at all, you pay with a CC through paypal.
You don't need a Paypal account to do it.
The reason for paypal, it is just a processing agent, it much easier and cheaper for OTT to get money to them from a member.
It also makes it easier because OTT is a Canadian owned site and you can pay in US dollars and paypal converts it and pays OTT in CD.
I use paypal in my contracting, custom designs, and repairs, as people can pay me without the high CC processing fees that banks charge.