The main thing is that the commission does not cost more than the order. Yes, and wait for confirmation of the BTC for a long time a dubious pleasure.
Exactly waiting for the operation is not too happy. It's not interesting for me to wait in the restaurant for several hours until payment arrives, if I'm very hungry.
Some people are waiting for confirmation of transactions, not only for several hours, but also for several days. And during this time you can just die of hunger))) The problem of long transactions should be solved