Whoever you're trading with, or buying from, is doing it right. I've never been a fan of tape on toploaders but using painter tape is a great idea. No sticky residue all over your toploaders, and it still keeps your hockey cards from sliding out. I'm sure this is something that's been used for years, but I've never received a package taped up with it. Also, I put all cards in team bags so no tape is necessary.
Nice cards, too, by the way.