Too true, I used to have a weekend job with a local training company (very basic, how to switch on the machine, howto access the net etc.) that merged with three other computer based companies and because of it I lost my job.
The new bigger company hired someboby (who knew alot less about the job than me) full time and paid him a hell of a lot more for doing the exact same amount of work.
I still fail to see the logic of that decision.

I know this is a very small scale example but it happens all over the world in any size company when their is a change in the management structure.