Stumpokapow
listen to the mad man
*bows*
There is a bit of logic behind it - for example if the "Quick Sell" and "Instant Sell" price are the same, it will exclude the "Quick Sell" button completely. Additionally, if there are no current buy orders on the market the "Instant Sell" button will be excluded.
The page also won't reload (just disable that item) once the item has been listed for sale, so you can pretty easily go from one to the next.
What took you until now to do this? Err.... That came out the wrong way. Not calling you lazy. I mean--this is a somewhat easy feature, so I always assumed the reason it wasn't implemented was because of worries about ToS violation through market automation. Has Valve changed their ToS on market stuff or you've just concluded it's not a fear?