at what points does your name get bigger on the online today box?

Higher level.

that's why i'm the admin with the smallest name

 I know that, which levels?

i think he has a good dozen or so sizes... there are a lot of levels in which the name grows... looking for a # level is just ridiculous

It's just a set of levels I made up I wouldn't take it too seriously as it may change at any time.
It was just to give the stronger/long-term players more prominence on the page