So the choice being:
A) Incompatible parts having a discount.
B) Incompatible parts not having a discount.
You'd rather have B, because a combo SUGGESTS but does not absolutely spell out compatibility.
I will agree that it is a valid point (that I do not share)
As demonstrated, if you report any incompatible combos to Wyldstallyn (EggXpert/Newegg Staff) he will make sure the incompatible combo discounts are REMOVED.
I think that's sad because volume/system builders can no longer take advantage of the discounts, but that's just my (as valid as yours) opinion.
RAWR!