5% off - great deals! I'm buying!
10% off - wow, can you believe my luck! I'll buy more! Double down!
20% off - holy crap, this is too good to be true! Load up the truck!
40% off - hmmm... maybe I shouldn't buy, I guess ____ could always go lower
60% off - now we've hit bottom! Buy buy buy!
70% off - OK, NOW is a great time to buy!
80% off - Hello, suicide hotline?
Man, you'd have thought the dot-com crash would have taught people a lesson. Just because it's on sale doesn't make it a good deal. It's the P/E stupid. It will always be the P/E stupid.
Just ask the pets.com shareholders. Or people who listened to idiot realtors on commission and tried to catch a condo knife in Phoenix, Miami, San Diego etc. last year.