I agree that we will see native 2.40 projectors in the next couple of years. I'm wondering if Texas Instruments is going to be a jerk about the pricing of these chips as they come to market and overcharge like crazy for them... It's been their practice for a while now.
Hopefully Epson will come out with a new LCD (or LCoS?) chip which is also native 2.40.
I'm not with you on the lumens thing. Our eyes need time to adjust from bright to dark and it can cause eyestrain and headaches to put to much light on screen. A theater is not the real world and I don't want to feel like I actually just turned the lights on crazy bright, then turn them back off again while using my projector. The only reason for more lumens is to compete with ambient light in the room, and at that point I've already lost my black levels so it hardly matters what the projectors does with black levels.
I'll stick with a dark theater area and 17 lumens per square foot.
What size screen do you have? It looks big, but I didn't read through everything to find a size. If it's 120" diagonal 16:9 image, then that's 43 square feet, and at best with the IN82 you may get just under 30 lumens sq/ft with the projector in the worst possible mode it can be in (dynamic, iris open, worst contrast, poor color reproduction). Still, very high. But, in standard mode, at medium image quality, it's more like 15 l/sf on the same size screen. At best quality, best contrast, it's more like 6 l/sf!!! That doesn't take into account lamp decay. All numbers are pulled from Projector Central's review of the IN82 projector. It is possible, if you have a light meter, that you are getting more out of it, but if you are just going by the numbers, and/or your screen is smaller than it appears, then it could be completely different.
The important thing, is that brightness can hurt the experience more than most people understand. The dark room is the key, the contrast of the projector is the next. Color reproduction comes in next. Absolute best projector I've seen is the JVC RS50 on a 106" diagonal screen. Completely floored me when I first turned it on with Blu-ray.