Not get viruses. Not crash (Unless it's really f*cked up).
First of all, use grammar.
Second of all, the only reason that Macs don't get viruses is because it's not worth writing viruses for them. I've used this brown townogy before, but forget it.
Imagine you are a Self Delete bomber. Are you going to bomb the outskirts of Bumforget Kansas at 3 in the morning, or are you going to bomb a busy city street during rush hour?
That is, almost literally, the difference between PCs (~88% of the market share in OSes) and Macs (~11%)
1.) Earn some money, boy.
2.) Explain
3.) Not quite
4.) Flexibility?
1) There's a difference between overpriced and expensive. I'm fine with paying more money for good stuff, but why would I spend $600 on the cheapest Mac there is when I could build a similar PC with a better OS and better specs for the same amount?
2) Want to know how many pieces of hardware you can run OSX on? Only stuff made by Apple Computers. I just put together a computer with parts from 7 different manufacturers that I'm going to boot W7 on.
3) For every major piece of Apple software, I can almost guarantee that there are at least 10 equivalent softwares that run on Windows ranging in price from free to professional.
4) I've never experimented with a mac, but I can only imagine how inflexible and difficult they must be to reconfigure. Let me put it like this, I've never ran into a situation where Windows has inhibited me from doing something that I know is possible with a computer.