You keep 100% of whatever you sell at a table...and you control the terms of the sale.
At $12.50 (half of $25), you'd need to sell a whopping (!) ~$40 at an auction with a 70/30 split (or ~$30 at a 60/40 split)...and sell at whatever price the auction gives you.
There are less than a handful of tables left, so someone take Mark's offer...
Matt