Not sure if you have ever owned your own business, but when you have several hundred employees, driving around in an M5 or a Range Rover can certainly hurt morale, particularly these days. Being humble and respecting the people who work for you day in and day out, is in my opinion, real leadership and the right way to run a company. That being said, I certainly learned that the hard way. Hence, the GTI and R
To a point.
I would also like to see my bosses be successful because that shows promise in the business they are running. When they are doing well, generally speaking so is the company and subsequently the employees.
If I see my boss rolling a 1995 Civic, I might be a little concerned as to the future promise of the company's profitability and maybe think that he is preparing for something I don't know about...
However, you are right that if my boss is rolling a Rolls Royce Phantom, I would think he isn't paying me enough and/or taking advantage of his earnings potential and not capital reinvestment capabilities to help the company.
Though I certainly believe the mantra 'work hard, play hard'. Its his business and his money and he can spend it however he wants. If I don't like it, I can go work somewhere else...
Real life example;
Good friends dad in high school was president/ceo of a $80M furniture manufacturing company with about 150 employees (still holds the position). Anyways, he got a group of us friends summer jobs in college putting together office furniture. He was like you in that he drove a Camry (loaded but...) because he wanted to convey a good, modest image for his employees. I remember when he got the 2003 Camry SE V6 and cross shopped it with an A4 1.8T Quattro at the time. He did have a very nice home and vacation property as well and was slightly LESS modest outside of work when his employees couldn't see him so he went with the Toyota.
Working in the factory for a few summers we of course talked to all the employees and they all thought he was super loaded and heard stories about his boat (just a 20' Sea Ray open-bow I/O and a few Sea-Doos) and his vacation home up north and all these things they thought he did/had simply because he ran the company. Most of it, while true, was just blown out of proportion because they considered him very wealthy (and for the most part he was). They even (to us, not his face) made fun of his Camry because they thought he spent all his money on his houses and boats and couldn't afford a decent car anymore because of it... Some thought he had some crazy cars at home but just used the Camry for work. Like a company car.
Point is, drive whatever you want and don't worry about what your employees think of your PERSONAL endeavors. They already know/think you are wealthy just because you own/run the business. What you drive won't change that...
The bosses/executives of the company I work for (VERY large Fortune 300 company w 20k employees) drive VERY nice cars... I expect them to. I would think it more strange if you had a $5/$10m, even $18m (my CEO last year) income and DIDN'T drive whatever you wanted...