Experience playing 'Rookie Leagues?' Admit your shame

If this was ever marketed correctly there would be no need for bots-
there would be an influx of interested customers-- as there are for all sorts of other fantasy baseball games which aren't quite as good.
But lets just say those companies might invest time and effort into attracting and keeping customers.
I know, its such a foreign concept.

I am looking for 2017 leagues to play in. Most take three months to fill.
Anyway of getting invites to leagues. I tried it out and liked it, but frustrated it takes so long to get in.
How have some players had 450 teams?
Murray