<shrug>
It's the cost of having someone else do it vs the cost of doing it yourself.

Don't go to Honda to change your oil for $79.99 you can get the oil and do it yourself for under $40.

Take you coin, ship it to the auction house, wait for money.
vs
Take pictures, post here, wait for it to sell, ship it, hope it gets there with no issues.

Not saying one is better then the other or one is wrong vs the other.

Real life example:

I could have sold my last motorcycle on the private market and probably gotten an extra $750 to $1000.
Would have take a couple of weeks and hours and hours of my time.

Left home 9 AM on Saturday, dropped it off at the dealer, got a check (that I knew was good since it was from a dealer vs private) and has the check in the bank and was back home before 10AM
Didn't clean it, didn't change the oil, almost didn't make it there since it had so little gas in the tank.

Now if I can only find someone to take the Ryker I would be good.

-Dave