Here's the reason ----   I ride a Harley Davidson. I know how to change the oil. Not difficult. I JUST DON'T WANT TO DEAL WITH IT. I take the bike to a neighbor who used to work for Harley, he charges me $100 and it's done. 

Frankly, I wish I had 500 clients like that -- charge them $250 each and each return would take 30 minutes.