You want a dead roulette? Because thats how you get a dead roulette.

Most people dont do it daily for the great enjoyment of level synced alliance raid experience (please note the sarcasm in my tone). They do it for the relatively fast and decent rewards. You can up the rewards, and the roulette could stay relatively healthy (see MSQ roulette), but you would still shut out a great many number of people.

Why not ask for a separate min ilvl roulette? I would very much like to see how popular that would be.