I haven't had my projector long enough to have to replace the bulb. On Normal mode, it would take just shy of a year using it 6h a day before I hit the life-expectancy. On Economical, expectancy is about a year and a half.
I have a couple roommates, so it gets a lot of use. No problems, just means the bulb will wear out a bit faster. Especially with the PS3 getting a fair bit of attention.
A few hundred bucks to replace a bulb every year or two really isn't that big a deal when you consider the cost of home theater stuff in general. And regardless of the projector you get, the bulb is pretty much a constant. (All projectors should have the expected bulb life in the specs - the W10000 is 2000h on normal mode.)
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