Be an interesting rabbit hole to investigate. 40% seems high for people to afford boutique building at retail component prices.
You’d need to find out what % of the population would build a PC, how education influences that number, how wealth influences that education, and whatever else.
Probably less than 1% of the population would fit in that actual number of people willing and able to buy and build at current pricing.

Man I wish I had some free time….Man I wish I could get shit done….