A customer walks into the brand new store downtown that sells brains. There are three glass cases, each containing a nice wet quivering gray brain. The first one says “SCIENTIST”, and it costs $100. The second says “ELECTRICIAN” and costs $1000. The third says “GUITARIST” and costs $10,000. The customer is confused, and questions the salesperson.
“I don't get it…why would I want a guitarist brain for $10,000 when I can get an scientist's brain for $100?”.

The salesman replied, “Because, it's never been used.”