What causes you the most frustration as a card collector?

[MuddyMules]

Stopping into a local card show only to find showcases full of game used cards and "sticker" autographed cards (if I peel the sticker autograph off of the card and stick it to my wall, does that make my wall a rare 1/1). What happened to players actually signing the cards? Where do these guys get all of these cards without knowing anything about the sport or players? My guess is that they buy a case, weigh each pack, open the different weight packs and then sell the individual packs to people who think no different. Tip for kids.....never by single packs at card shows, especially when the showcases are crammed full of memorabilia cards. Better yet kids, stay with vintage cards, they have a great history lesson.

We stopped in a show last weekend, with my youngest son who collects newer football cards, and some guy was sitting there behind his display case, crammed full of the above mentioned cards. We asked him about a certain set and he asked "what sport is it?". How do you consider yourself a collector/dealer and not know much about what you are selling? Give me a break.