Would be nice of some more sha256 rigs are added. Currently only 3 and 2 of them rented. If you have sha rig, comeon, lets get you listed on.
Did you add bidding yet?
Neat idea, it's good to see innovation in the mining space. I'll have a rig or 2 pointed leaserig's way as soon as they are built! My only thought would be that an auction system could be useful, though I see that others have already suggested this.
I dedicated a lot of thoughts to this, but at the end concluded I will not do it. The reason is simple; price is NOT the only factor that should be considered. When you sell/buy a coin, price is all that matters. Here, other things are important such as: quality of service, stability, providers tendency to do refund or extra hours if something goes wrong, etc...
I will eventually reorganize first page - free rigs will be at the top and the ones that are going to expire soon will follow - sorting by availability. I will also add additional sorting options such as sorting by best price, and if once I implement rig ratings - sorting by ratings.