Reasons 1 and 2 are why I don't recommend it for everyone and my grandmother.
Reasons 3, 4, and 5 are a mixture of ignorance and/or FUD.
(Technically, not actually sure about 5, because I've never seen a TCO report I could trust. I find it hard to believe that maintaining a Linux environment could be cheaper than a Windows one, even taking into account higher-paid (and more-skilled) employees to operate it.)
I like Linux, although it is taking some getting used to. I still have trouble playing media clips at times. I've got a lot to learn with computers in general, but Linux is pretty user friendly.
This is the first pornsite I've found in years that I'd actually advertise to swarmers. When you first load it up, it looks just like every crappy scam site out there, except that it's real. It's huge, it's updated constantly, there's no spam, no popups, and no bullshit -- and it's completely free. When you sign up through that link above and respond to the confirmation email, I make a bit of loose change.
See what other swarmers have to say about it. People love this place, so I feel fine about sending you there and am confident you will enjoy boners.
