I've definitely had bad experience with at least 1 bike shop in Z.
I took my bike in for a puncture repair (could've done it myself, just didn't feel like it that day) to my local bike shop at Schmiede Wiedikon, "Velofix", and when I picked the bike up the guy said my back gearbox was old and worn and should be replaced (he then proceeded to take out some fancy tool that was supposed to prove that).
When I asked "how much would that cost?" he said I should probably consider buying a new bike instead. Avoiding getting annoyed I said I was not interested in that, as far as I'm concerned my bike runs fine, and again asked how much replacing it would cost. 250 CHF with labor he said. I said "I'lll think about it" and left.
Skip forward about 1.5 years of using the old box just fine, I decided to do it myself to see how hard it could be. Found out what the gear box ID was (says on it), googled around, ended up on bikester.ch where they had it for 13.90 CHF (!), I also had to buy a tool attachment for removing it - 8.90 CHF, and to make my life easier, and a chain whip for 13.90. Total time to do the job myself, probably 20 minutes after watching a video on YouTube how to do it.
In the end I also replaced the chain, the saddle, the front gears and the pedal bars, pedals themselves, handlebars, and some other minor items, all for less than the 250 CHF they wanted to charge me.
I understand that labor costs must be high in a bike shop in central Z, but I really disliked the attitude that I should just buy a new bike instead of getting an old one repaired, and then a 250 CHF figure with no basis just tossed at me. I'm sure there's better bike shops, but bikes really aren't that complicated, there's YouTube videos for nearly everything, so if you're even a little bit handy, try to do it yourself. Just take pictures as you dis-assemble stuff so you remember what goes where