Yes live rock is vital to a healthy system, if you're concerned about price, buy dry rock/dead live rock, which is a lot cheaper and will become 'live' after a couple months. And what you're saying about looking at a tank for hours, thats a matter of aquascaping, which doesn't necessarily mean that you need piles of live rock. Try using moderate spaces between clumps of rocks, or try overhanging ledges with the rock. Good luck!