Yeah, I forgot to mention how humorous his assertion was too. He's so certain that a light mount is bad that he takes it to a grocery store to back it up.
Regardless, light doesn't mean "fragile." If the mount is actually "fragile" then that would be something, but if that were the case I'm guessing you wouldn't have ~1450 people giving it 4 or 5 stars.
Wall mounts are pretty much universally less expensive at Monoprice, but of course you have to pay for shipping.
All true, but then we're back to my Amazon thread
Plus, for clients I need to know when my orders are going to arrive. For my own stuff, it's not essential to have a solid delivery date, but it can be all over the map on Monoprice. I like that if I need a part for tomorrow or the next day I can get overnight shipping for $4 and build that into what I charge for the part.