WHY? The most obvious aspect: More and more people become hesitant to make purchase today and decide to wait few days to get it cheaper - bad for merchants (10-30% of potential sales are lost).
Yeah, and electronics manufacturers are going broke because everybody waits until the prices drop before buying. Sorry, your argument isn't supported by the facts.
Why did you quote mine and then strawman my position?
I for one am unclear why that's a distortion of your argument. People don't stop needing things just because holding on to money longer can mean you'll get more value for it tomorrow.
Every time I buy computer hardware, I know that if I wait another week/month/whatever, I'd get a better value for less currency spent. But that doesn't seem to stop me from upgrading.