$50 isn't worth anything?
So, we are not buying at $50 discount - how about trying a $100 discount? Yep, I'd very probably upgrade my 5-year old family PC at that point but I can't justify the money. Heaven knows we need to replace it, but c'mon, the WAF is high at the moment with all this doom and gloom around.
Admittedly, the vendor will probably make a loss at $100, but they'd better shift the stock as it's value is only decreasing anyway. Cut the losses.
To summarise: Discounts would still work but they have to be sufficient to make us want to open our wallets. Money's tight, idiot.