Revolvers get higher prices why?
'Cause they're better.
OK, I couldn't resist.
A lot of pricing, and most of marketing is mysterious and arcane. Why did Ruger drop the SP101 in 22 RF? Supposedly the gun did not sell enough units. Yet used ones sell before they hit the ads.
Back to your question. Many revolvers have extensive fitting and precisoion machining to manufacture them. At the very least, there are multiple chambers to the SA's one. Many (not all by any means) semi-autos are simpler to machine, so cheaper per unit to manufacture. Economies of scale apply also.
So, if a SA costs $100 to produce and a Revolver costs $150 to produce, the variable costs on the revolver are $50 higher than on the SA.
The the fixed costs (which, by the definition of the accounting term of art "Fixed Costs" as those costs which remain constant, independent of how many units are produced, as contrasted with "Variable Costs" which are fixed per unit, so vary in accordance with how many units are produced), if the SA production is 1,000 units a year and the revolver production is 200 units a year the fixed costs are spread five times thicker on the revolvers than the Semi-Autos.
All this is speculation, based on basic cost accounting.
Then there is the economics. People are obviously willing to pay the prices being charged. Why? Revolvers can fire more powerful ammunition than semi-automatic handguns (generally). The 45 ACP and the 10mm are considered to be pretty powerful semiauto rounds, but are relatively light compared to the 44 Magnum, much less the 454 Casull, 475 Linebaugh, 500 Smith & Wesson. Some legal restrictions make revolvers more attractive. In California, Single Action revolvers are less restricted than Double Action revolvers or semi-automatic handguns.
In short, while I don't know, I think I have a clue or two.
Also, setting prices is a marketing decision, made by humans who may have flaws in their thinking as much as anyone.
Lost Sheep.