Goofy thread, for me! I definitely can't pay for my house with money savings from bike commuting. In fact, my wife thinks I'm spending money on it that we wouldn't otherwise, and she does the bills. So, I'm just glad to get out there and enjoy the bike rides.
In truth, because we have four drivers (I've got a 16 and a 17 yr old), my two cars are pretty well tied up. The fact that I bike commute likely saves me from buying car #3, which would be used and would likely cost about $3K/ yr. Again, that's funny money on account of my wife not seeing it that way.