Please don’t take this as an offense, but you are trying to sell a very old design frame for a wheelsize almost no one uses anymore. You may want to reconsider your price point, if you want this to sell.
It is a classic however you will need to wait for a collector who will pay for it or someone who really wants to build a 24" fat tyre which is much harder to build than 26" (I know I have done it).
There are not a huge number of either and if someone really wanted to build a 24" fat tyre but werent a collector they would probably prefer to pay a bit less and get a lighter custom built aluminium frame from Flansberrium.
This is one of the greatest unicycle frames ever made. I took mine to a custom framebuilder and had a disk brake tab and cable guides welded on and painted for a reasonable price and have a unicycle that will do anything. Even if you go with the best of everything, you’re at less than the cost of a very mediocre bike.
Lots of people seem to think this an awesome rig but it’s still available. Up on ebay with a lot of watchers but obviously prefer to save some fees and sell it here. Thanks!