and the richer the customer, the lousier the tip.
we charge 150 balls for a reinstall [OS + drivers + updates + set of desired software] + installation at home, checks and configuration
i had a customer do me a reinstall, and he came over to pester me 5 times, costing me two hours of attention, he hung around the workshop looking over my shoulder, and still requiring more explanations.
reinstall + home install =150
2 hours of explanations locally = 2x60 = 120
Normal = 270
what he got billed: 170 [100 off, just to get rid of him]
my tip: 10
[so you know i can come back to you and ask a few questions here and there, and you will help me, will you

]
he came back, handed me his LuxTrust online certificate dongle knowing he should not, and i "inadvertedly" called his bank stating i had his dongle and his PIN, as i am trying to resolve an issue.
They were mad and locked his accounts.
OOPS.
GTFO...