I always thought the current level-up boosts were a strange set-up. Wouldn't it be a good idea to have the boosts tie in with tier e.g.
Legend's can boost until the last available equipment (level 94 is it?)
Tour Masters can boost to level 'x'
Masters to level 'y'
...and so on
Everyone could still level up the old fashioned way, playing everyday, tournaments etc.
Just thinking out loud.