With a mac you get options! Most decide very quickly that they love OSX and want to stick with it. If you decide that you would rather stick with Windows or already have Windows versions of programs, you can boot into Windows on your Mac and it will run just as well if not better than comparable PC's on the market. With a Mac you always a very secure machine which will run superbly and never let you down, along with the fantastic graphics and ergonomics that have made Apple famous. As far as price goes, sure, if you're comparing it to a $300 Acer, a Mac probably isnt for you. But, if you're looking for a professional product, most decent business/pro grade machine run close to 4 digits anyway, which is where the Apple models start.
On top of this, I dare you to ask people who have used both platforms for their opinion.I have found that most people with a strong bias toward windows have never owned or spent a significant amount of time using a Mac, while almost every Apple "fan-boy" has converted to Apple within the last 10 years, and many are very proficient with both platforms. As someone who works in the IT industry, I am required to work on both platforms everyday, and throughout every week. I can tell you from my perspective, I groan every time I have to sit down at a PC. Almost every time the machines have multiple instances of badware/malware, and obviously things rapidly go downhill from there. When I sit down at a mac however, generally, it just works.