The Friendless stat site gives you some of this data but only for those people who have signed up. The site pulls data from BGG.http://friendless.servegame.org/stats/
The top listed user has 3545 games.
Aldie is listed at 2167 (#3)
There are 4 people with collections >2000
There are 9 people in the top 1% of users on the site (>1600 games)
41 users have 1000 games or more (that's roughly the top 5%).
153 users have 500 games or more (approximately the top 17%).
206 users have 400 or more games owned.
327 users have 300 or more games owned (approximately top 35%).
477 users have 200 or more games owned (roughly top 50%)
747 users have 100 or more games owned (about top 80%)