Those are perfectly valid reasons, but they aren't really much use to anyone who doesn't share those circumstances, and don't really have anything to do with upsides and downsides of the language itself. That would have been far more relevant to us outsiders.
Also, "I'm buying a MBP" translates to "I'm serious about startups"? Who says image isn't everything? Besides, everyone knows serious hackers use IBM-era Thinkpads!