Allow Filter on Negative vendor-profit

[lystig12]

I would very much like to be able to filter on negative vendor-profit - currently this does not seem to be working (which might be intended).

Reasoning:

Say I'm a lvl 32 warrior and I'm looking to buy a new weapon on the AH. I find a 2H axe that maybe costs 2g33s, which looks like a lot. But if it vendors for say 1g88s (fictional value), then the "actual" price of the weapon is 45s - not too bad.

I was sure that "vendor-profit/-45s" would return the fictional item in question (and others that have "actual" value of 45s or less), but it doesn't work.

It will be very helpful if you could do this kind of filtration - especially when levelling since it will make it easier to gauge the actual "cost" of an item (assuming it will be sold later when you acquire another upgrade).

Hope it makes sense!