Standardized Connectors

I have had a number of desktop computers over the years. They all have the same basic power cord. It's detachable so if it is damaged it is easily replaced. Why is it that nothing else is like this?

My favorite is cell phones. I have a phone for work and a phone for personal. They each have a connector that was claimed to be the "new standard everyone will be using". They're not the same connector and none of my wife's phones have used either connnector. This includes the phone she just got in the last week. This means we have five devices that uses four connectors. The only two devices that share a connector are the two iPods and that is proprietary to Apple.

Is there really that much money in requiring your own specific connector?