Played right it 1) can make you more money, although that's tough to quantify right now with everything going to hell 2) make you more flexible, since you're not on the hook for a major life change if you want to change your investment vehicle and 3) diversifies you and provides more security -- your investment is not coupled to where you sleep at night.
Same deal here. Bought in 2005 with the intent to live in the house for a few years and move to a different part of the country. Dreamed about a home run, hoped to break even, didn't expect the worst financial crisis since the great depression. Fine time to be holding the bag. :)
Some people just like to tinker, and when you don't own something, that's not really a possibility. After renting at my current residence for over a year, there are some things here that annoy me: we have no porch to speak of, we have a huge kitchen that is laid out horribly (not even a dishwasher), there is a nice basement that is just begging to be finished, and all the walls everywhere are white. It sure would be nice to have a place of my own where I could fix these "problems", both adding to the value and increasing my happiness, all without having to move.
And there is just something satisfying about owning something, about working towards a common goal with someone you love, in building something together. When the area you live in is pliable to your wants and needs, happiness is just a little bit of hard work away.
Even worse than non-enforcement has been the active encouragement by the legislature of lots of this stuff. Tightening up the lobbying and revolving doors might help cool off some of that, but I don't really know.
Some of the regulation concepts being floated (not my ideas) are to ban off-balance-sheet vehicles, tighten definitions of what can be put in Level III/model-priced assets, and require that CDSs and other derivatives/wraps be traded on real exchanges so that a market-maker acts as central counterparty).
I'm not a financial expert, just trying to learn about this stuff. Maybe someone more knowledgeable will chime in.