Well if people don't know how to do "technical things" they should bloody well learn!!!
Ignorance is no defence and to be honest, you should try and learn how your bike works, you never know when a bit of knowledge will help you out of a jam...
TF tuned do do some useful work I'm sure, but I reckon a good chunk of their time is probably spent doing stunningly simple jobs for thickies who'd have trouble telling their arse from their elbow...
from TFT site
TFT Service - Clean, Inspect, New Air seals (where applicable) + Oil & Wiper Seals