No it's not. Millions of PC's are sold each quarter, even though they cost as much as a TV and they get cheaper all the time. When you need it, you need it. You might wait a couple of months, but at the end of the day you have to pull the trigger based on need. It's called marginal utility. When you determine that the usefulness of a good (to you) outweighs the usefulness of the cash that good would displace, you buy it.

I wouldn't hold off on a car or housing - to assume that is ignorant - though with prices going down I would likely purchase a new vehicle much sooner than I otherwise would have.