Albin Counter Gambit?

Every time i come against the queens gambit i now play the albin countergambit but i was wondering how much this has been analyzed and dose anyone else like this one? 

 Particularly the line 1 d4 d5 2 c4 e5 3 dxe5 d4 4 Nf3 Nc6 5 g3 Nge7 is quite playable. It's probably possible for white to hold the pawn if he plays Bf4 but it's very risky (black will play ...Ng6 both hitting e5 and this important bishop, which if taken will also weaken his position) and black probably has plenty of compensation. White usually returns the pawn and perhaps has some chances of advantage, but black has his play in an imbalanced position.

However, other white moves like 5 a3 and 5 Nbd2 are extremely interesting and they may or may not be really good for white.

I wonder why 4 e4 isnt more popular against this gambit ?