Good point, keep bulb life in mind.
I use my projector as my main display, averaging 6hrs/day on it.
I get about 1.5-2yrs on a bulb. I factor that cost in, and also plan to upgrade within 3yrs so....
$1300 projector
$300 replacement bulb
-------
$1600 - for around 3 years, or over 6000hrs of viewing.
Add in another $400 for a screen, and it cost me under $2000 for a 1080p 92" TV that will last 3years at least.