I ticked the boxes for the first four options. It all comes down to the audience though, and having willing buyers and willing sellers.
If there are domains I like, sure I'll bid on them. If they have a reserve, no problem if the reserve is less than I want to pay!
And if I can see domains selling for reasonable prices, then sure I'll list some of my domains that I have no plans for.
But how do you get the audience, and especially one that is will to pay decent money as a buyer... That's the tough part.