The grey balls don't show you anything so in my eyes it's absolutely worth it. You get to see the skill balls for 19 players. That's for a price that'd normally show just 10.
Anyway, I'd do the "whatever-it's-called" to get every player's height and age first. After that you can see if there are enough players matching your criteria in that 1 and 2 grey ball group.
We have both said a lot of things that you are going to regret.