The downside of projecting on a wall like that is the blacklevel sucks if there is any ambient light in the room at all. You end up needing blackout curtains just to watch TV. Even with the room totally dark, walls are not great projector screens, most people end up installing screens in the end, and screens aren’t cheap either.
Projector bulbs are historically priced at astronomical levels as well, although I don’t know about this projector in particular. Expect to pay $200 every 3000 hours of viewing time to replace the bulb.
