You guys only think you want gralats to drop. Trust me, you don't. All it'd do is encourage players to use some additional alternative account where they PK or store gralats. It'd probably result in people buying less packs overall, which is bad for the game.
One of the few cool things about PKing is it can be done very casually without too much risk, and when you risk losing something that you spent a lot of time getting or even paid for, people begin to get scared and refuse to do it anymore. It'd be pretty stupid. This coming from someone who has like 200 gralats right now, and would only benefit from that type of a change.