Tipping confusion

[otnemem]

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Guys who deliver a TV I ordered online?
Y not close

Landscaper?
N

1-800-Mattress delivery guys?
Y and offer drink. not close

Plumber who replaces a leaky pipe?
N but Y if its an emergency call

Electrician who installs a ceiling fan?
N

Guy who installs DirecTV dish?
Y

Contractor who re-paves driveway?
N. not close

Furniture delivery guys?
Y and offer drink. not close

Trash pickup guys (public works, not private)
Xmass Bonus

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I agree with all except for the satellite dish install.

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*ahem* it's not a standard tip

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Why would you tip the satellite guy and not the plumber. I don't tip for installations/repairs. I'm already paying out my ass for the service.