Also you do not have 36000 different games, some games have a lot of different versions for example version number and region. So you may have 10-15 versions of the same game in some cases. In those cases Launchbox will combine those games into one entry, if you right click some of the games you will probably see multiple versions of the same game. Also MAME uses a parent child structure so a lot of games rely on another zip as well to actually work, which will bring down the game count also. Also as @Retro808 mentioned if you used those defaults in his image a lot of stuff wont of been imported, like games that don't work, fruit machines, arcade games with no screen so can't be emulated etc.
I have a full MAME romset which I imported and I only have 3717 Arcade games in Launchbox.