Right or wrong, there are a lot of people who treat guys differently based on what they drive. In a corporate office there is social pressure to drive something that fits your role. Can you ignore that pressure? Of course. Do what you want and own it. But that pressure is still there.

When you have a 2-seat sports car you can't be the one who drives when the team goes out to lunch. If your car looks more expensive than your coworkers' cars, they start to gossip about how you can afford it.

Declaring it a midlife crisis is an attempt to get ahead of that. They're saying that they didn't buy it to avoid driving the team to lunch. They're saying that it's a rare treat, not something they could easily afford. They're saying that this car isn't their personality, it's something they wanted to enjoy.

Is any of this necessary? No. But it might cut down on rumors, and that put their mind at ease.