Same boat here.
I have severe GAS. Once I started into FF and L lenses it was over for me. You can see in my signature how much I have purchased since the launch of the 5d. That does not include the following I have bought and sold
24-70 F4 IS
16-35 2.8 II
now I am looking to go on vacation and want to repurchase the 24-70 F4 and 70-300L for a lightweight kit. So I am spending $2500ish just for a trip. Again GAS. Yes I could rent but I like owning and using it whenever you want.
Also I agree about collecting enough lenses to mask the purchases. My wife would not know at this point which lens I added except maybe the 300-600mm super tele's. I want one of those but not going to be able to get away with a $6k lens.
Also looking toward Sigma's new 50mm and Canon's hopefully released 100-400mm.