Yup, there is even a big difference between owning a projector for 10 hours or owning one for 40+ hours, but we all can only do what we can do.
Personally I think the Epsons were really good at certain types of dark scenes (I owned them and set one up for another person), but still had trouble with maximizing contrast in super dark movies like Harry Potter (I've watched Harry Potters on the 8700ub and the JVC RS-45 and the Sony vw70, the Sanyo z4000, the Mits hc4000, ok I'll stop there). Some of these I had them side-by-side split-screen while watching, as well as I did A/B and back to back viewing.
There aren't a whole lot of movies shot as darkly as Harry Potter with the same sophistication in camera work (I'm sure there are a few, just not many). As tired as I am of Harry Potter, some of the camera work was amazing in the dark shots. LOTR also has some nicely shot dark scenes, but not nearly as many. The newer Star Wars has some sophisticated lighting. I've seen some animated films with some really sophisticated lighting in dark scenes too.