Would you pay for a MOD if that was possible?

[Yuhaney]

Plenty of fantastic games have been created using existing engines. I do agree that a mod that uses all of the original assets and makes almost no adjustments whatsoever isn't deserving of being called its own game though.

Pretty much this.

I have no problem with the fact that game uses same engine than the game the mod was started with, but I'm really not too keen on playing mods (even if free) that look and feel the same than the game the mod is made from (excluding few titles).

But in general, I would not pay for a mod that doesn't do radical changes by adding new assets to the game.