Why cant they make 1 standard USB cable?

In our house with 3 of us we have my Pentax , my wife's Canon point and shoot, 3 different mobile phones and card readers all with there own USB Cables, none of which seem to work with each other!!

They even look the same ,same size and everything which makes it a guessing game to pick the right one.

Anyone else find the same?Maybe we can start a action group?

The only consultation is when it comes to Battery Chargers it,s worse.

Thanks for listening Prang