I have six Macs in my home so far and zero PC. At least five are still working btw and I certainly know what I am talking about because I have used almost every type of machine you can find from handheld to mainframes, workstations some running Windows others Linux and even VMS.
They are a number of things you cannot do with a PC and that you can easily do with a Mac. Everything you can do on a PC can be done on a Mac either because the application can run in Mac OS or because if your Mac is new you can install and run Windows with it.
Macs are only more expensive if you compare them with the non brand name machines. But if you want to compare apples to apples so to speak you need to compare the price of the Apple machine with DELL, IBM, Fujitsu and alike. Apple is still cheaper than DELL (same configuration) and Apple customer support is the best you can find.
What else to say? Apple Machines (and the Mac OS) are mostly trouble free. It's plug and play right out of the boxes and you do not have to worry about viruses.