That depends on your definition of enthusiast, and the timescales you're looking at, but generally, yes. PCs didn't really become an option in homes until the early to mid nineties (I remember my parents getting their first PC - a 286 running at 12MHz with 1MB of RAM and a 40MB hard drive), and that far back there was little to differentiate them apart from CPU speed and amount of memory. 3D accelerators were a thing of the future (although I remember that computer ran Catacomb Abyss really nicely ), so there was only so much you could do to a computer.
What's mostly happened since the late nineties - when 3D really started gearing up and there became genuine competition in the graphics market, essentially creating the modern enthusiast PC segment - is that the price range for components hasn't shifted much in numerical terms (ten years ago buying ATIs top graphics card would still set you back over £400), but that obviously means that in real terms the technology has become more affordable due to inflationary pressures. There's fluctuation in overall platform cost, particularly around new tech inflection points (e.g. DDR4 at the minute), but the upper and lower end of the ranges don't shift all that much.