Jesus... Ok, I will keep this simple: I used to work in Switzerland for over a decade. I work in Luxembourg now and grew up in the area... so I have a pretty good idea.
60k in Lux gets you a better life than 90k in Geneva.
You dont seem to believe the feedback you got and you dont want to believe it... so go ahead and make your own experience. You wont have any serious hardship but trust me, 60k in Lux is better. And I will break it down:
1. You are right that the rents in Lux are totally inflated. (Thats why I live across the border like over 50% of the people working in Lux...) Geneva will still be a real estate market you havent seen before. In Lux are the prices too high but if you are willing to pay them do you get a place. In Swiss cities are the prices even more inflated but you will still struggle to find a landlord willing to rent to you for those prices... because they can typically choose from a lot of applicants and dont necessarily want the fresh arriving immigrant.
2. I honestly dont care if you believe Swiss salaries or not. A cashier at Aldi makes 57-60k CHF a year. If you have a college education are you very quickly in the six digits. It took me about three years to get there after graduation. But I am in IT, in commercial roles thats even faster. You did not say what you are working in, only that you have five years of experience... so I cant tell you if 90k is a good offer or not. Its certainly at the low end for a professional profile with 5 years experience. Normal in the country side, but not in Geneva or Zurich.
3. The thing about Switzerland is that the price levels are insane compared to Luxembourg. The stuff simply adds up:
- health insurance. I wont go into details here, but it is a cost factor in Switzerland. Its not an automatic deduction included in your taxes as in Lux. Loads of info on it available here.
- Food. The supermarkets have price levels you havent seen before. And thats nothing compared to the restaurants. My lunches in Switzerland were about twice of what I pay in Lux... A pizza is easily 20 CHF or more. Even eating at Mc Donalds is 50% more: 13 CHF for a Big Mac Menu instead of 8.95 EUR.
- Going out. Even just parking your car in the city center is 5 CHF an hour. I think even Clausen is 2 EUR(?). If you like me enjoy a beer or two in a bar... well, lets just say that the salary difference you are getting will be used up rather quickly.
- a cheap gym membership in Zurich would be around 69CHF if you make a 12 month subscription. Thats the sort of gym that costs you 19.99 EUR in lux...
Simply put:
- 90k CHF for Geneva isnt a stellar offer. You can life off it, but it wont get you a better life style than 60k EUR in Lux... but a slightly worse one.
- you dont seem to like to hear this or decided to simply not believe the feedback you got here... so go on and make your own experience. Please report back with all your complaints on "Why is XYZ so expensive in Switzerland?"... or just look up all the other threads where people already do so.
P.S: Are you really complaining about flight prices from Lux? Do yourself a favor and check just how much more it is from Geneva... I just returned from the US via Portugal with TAP on a brand new 330Neo and just love how well Lux airport is connected in Europe... the only expensive flights here are the ones to Zurich. Swiss is milking this route so badly that there are private jets offering competitive prices!