Is 99 the New 100?

While peering on Mr. Schreiber's desk, my homeroom/chemistry teacher, I came across a paper listing examples of what teachers should say to congratulate their kids. But the list held only 99. 99 is a lot, but why not 100? I'm sure people at the county could think of something else; it's not hard to just smile. Or perhaps 99 has become a more powerful number. I guess those double nines are pretty potent. i mean one nine is pretty concerning, but two?? That's a doozey.