Good feedback(no pun intended!)

Dear Arrogant one, let me tell you that in the TESOL field that they sing a song...

"Make new friends, but keep the old,
One is silver and the other gold."

Now substitute friends with teachers.....

Apparently they want new people all the time because it's interesting meeting new people. Imagine how people feel once they have known each other 7 years, married couples feel it. So it's not a dig at age issues as in ageism, but the need for "new meat".
A bit like your "fresh manna" concept. No one likes stale friendships, and they like new exciting ones.
The director I was telling you about told me that adults like new teachers because it promotes conversation, and did you know in one school in Japan they post a poster on the doors of the school to say this is your new teacher "Kristy is coming" and she looks so beautiful like a barbie doll, so everyone wants to come to talk to beautiful Kristy!
A real teen mentality. She's a babe.

So pick yourself back up my dear Arrogant One, with all that explained, well the world is your oyster.

Pecker up,
Stella.