Well now that that I understand your monolith reference, I no longer feel like being harsh 
There’s a colleague at work who’s a Mac fan-boy, and he pretty much exactly looks the part - long often unkempt hair, a collarless t-shirt, usually black with some design on it, a pair of jeans that look like they haven’t been washed for a week, age 20. I get on with him but on the mac-versus-pc advert I’m the PC. I usually refrain from laying into him about the mac thing but sometimes when the topic comes up I can’t help but do it 
Anyway, When I bought the PC I am currently using (intel core2 quad core, 4gb ram, geforce 8800 Ultra, 24 inch monitor and 22 inch monitor (one above the other) edit: one terrabyte HD (well two 500gbs in raid 0 for the speed) ) as you can see by the specs, cost wasn’t an issue for me. But I didn’t once consider going for a Mac because I have the following pre-conceptions. Please correct them if they’re wrong…
You are partly paying for the brand, so you’re paying more for the same power.
Many popular games won’t run on it.
You have less freedom regarding the hardware inside (can you choose from a large list of processors, amounts and types of ram, graphics cards, motherboards, fans, psus, case, monitor brand and size, etc etc…)
For someone with 20 years PC experience there may be a period of time needed to re-adjust to the HCI style of the mac (Human Computer Interface - It’s a poncy industry way of saying - how a typical person and computer interact with each other)
When I bought my PC I had the following needs - Something to play the newest games, something to use the internet with, something to write software on, something to create 3d art on, something to listen to music, watch films and tv on.
I know you can probably do all that with a Mac. I’m just listing what my needs were.