When someone tells another 'You have no ambition', it may just mean that they have a different ambition. Making the most money, or advancing up the management ladder may not be as important to one than as to another, but that certainly doesn't mean the 'unambitious' one doesn't have an ambition to be happy, satisfied, and enjoy life to it's fullest. If you want the ulcers that go with a lot of 'success' in business that's fine. But don't criticize those that don't. I never told anyone that they were 'too' ambitious, even when they were losing their minds over a delayed production date, even when, if they'd listened to reason in the first place, it wouldn't be necessary. And unambitious doesn't mean you are just like Wally either. You can work hard and earn all of your pay and still not desire to be a corporate tycoon.
Pardon the lengthy comment, but as you may have already guessed, I heard the ambitious line in my life. I'm now retired, wonderfully happily married, and am enjoying life enormously. And regret my philosophy not at all.