Develop My Domains or Park Them?

Which do you prefer to do with your domains? Parking used to be extremely popular, but some companies have gone down the drain while pay-per clicks have gone down on the others. At this point in time, lots of people have started turning to developing their domains. Even if it’s just a small one page website with some content, ads, and a for sale sign or link.

Which do you do? Any particular reason why??