While other platforms offered better “direct write to screen” allowing games and some demos to run smoothly, the Mac still had a superior usable interface and platform.
Additionally, while 486 clone PCs were available cheaper, they weren’t cheaper if they offered the same features of a comparable Mac. Things like SCSI cards and drives, which were standard on the Mac but expensive add-one for other platforms.
With Mac, you got a nice looking sophisticated operating system that offered superior ease of use, as well as WYSIWYG display and printing. Built-in networking on pretty much every Mac, and the ability to use that advanced GUI on even a machine with just a single floppy drive and no hard drive made it a no brainer for a lot of people.
Today the differences between the Mac and other platforms such as Windows are mostly erased. But take Windows 3 for a spin next to Mac OS 7.5 and you’ll see where the value went.
You may be right in that buying a 486 system from scratch at the time would have come close to the cost of a Mac. Upgrading and transplanting is a different story.
I inherited my father's 286 machine in 1989 and upgraded that box over the next 10 years. When I upgraded to a 386 motherboard, I transplanted all of my ISA cards and my MFM drives, and they worked perfectly. Then I upgraded my MFM drives to IDE drives keeping everything else. That was followed by a 486 motherboard and transplanted everything one more time. I ended up keeping some of my ISA cards, my mechanical keyboard (whIch I sorely miss to this day), my mouse, and my monitor for several years. Heck ... I kept it all going up to a Pentium. Yes, there was new memory to buy, and I upgraded the video card every now and then. So, I ended up buying the final computer in piecemeal fashion over 10-ish years. I'm not sure I could have done that with a Mac. I'd have to buy the whole kit and caboodle each time. So, in my case the x86 system was far cheaper for me.
My Atari ST system was very difficult to upgrade due to the closed architecture. There were no expansion slots, and nothing was modular about it. Accelerator cards could be added but that was kind of like performing open heart surgery - and they were expensive and hard to come by. The non-standard ASCI port made external storage wickedly expensive. In going to the 286 system, I mentioned above, I had to throw the whole Atari ST system away in a sense. Nothing carried over.
I think a lot of youngsters followed this piecemeal upgrade path in the 80s and 90s and were able to cobble together some powerful systems for the time. The original Sound Blaster card coming out changed everything for x86 systems. It felt like the system was finally "starting to begin" to catch up to Amiga. This probably played a huge role in making the x86 system a platform of choice for the demoscene and gamers.
In my case, I missed the whole Mac experience in the 80s and 90s. It was too difficult/expensive for to get in. The B&W screens of the original Mac didn't astonish me, and the color Mac II machines gave my father a proverbial heart attack when he saw the price. Now that I'm older and less polarized by the "PC vs Mac" wars of that time, I want to explore the 68k platform and see what I missed out on. The user interface is one simple element I missed out.
@MrFahrenheit, you are right in that the GUI is extremely sophisticated. Even back then I thought Windows 3.11 and earlier sucked.
It wasn't until Windows 95 when I thought to myself that I could begin using Windows for real. But it was so fragile and so buggy. It wasn't hard to crash. Macs just work. No futzing, no heartburn, no nothing.
If there isn't much of a demoscene presence, then that's cool. Let's see what the Mac scene had that the other platforms did not.