Originally Posted by
Rebelyell
Because we are too poor to afford it.
Seriously, the reason we don't travel more is because we can't afford to travel more. Buying two rooms just doubles the cost. We usually try to use points and/or free-night certificates for many of our family trips, and if we use them all on American trips then that's a European trip that won't get taken. (And we may be FORCED to get two rooms in Europe).
I've started using Airbnb.com for some of our trips - more space for the same or less money as a mid-range hotel. No points, but sometimes the extra space, kitchen, etc. is more than worth foregoing the points.