Do you pay tax on every
g'day, so-long, ciao, cya, have a nice day, merry christmas etc? I don't think so.
If one is working like a one-legged-ass-kicker people understand, if not you don't lose a birthday for comaraderie and salutations.
I remember in my military days, saying "see ya mate" on reply to a QF 76s "thanks for the help, catcha around" on transfer to the next enroute sector. SATCO standing behind me (sneaky scottish
pr!ck*) bellows "where the f*** is that in MATS?" ... (me: quick as flash) "under salutations Sir" (*deathly silence*)... (me)"Speedbird xx descend to Flight Level..." (bugger had skulked off!)
*no offence to my Scottish brethren intended (my wife is Scottish).