Don't take it so personally. I think by "That makes zero sense" he means "The rewards of saving $3 by using tape rather than a proper mounting solution is not worth the risk of damaging the cards by standing them straight up like that."

Check out Catfish. He's got some seriously high quality rigs, and you won't hear people say "Oh man, you should have used Scotch Tape instead of those 2x4s. You could have saved some serious dough!".