The supply issue starts with the manufacturer, and I doubt any of them think it’s worth scaling up for what could be a one or two year shortage. I doubt anyone is sitting on years old inventory. So they have additional costs to increase production, are not just the employee’s wages, but the employer’s share of FICA, federal and state unemployment, additional workers comp, additional employer’s portion of health insurance (if eligible), training, materials, shipping and distribution costs, etc.
It costs money to increase production, so it costs more to get it to wholesalers or in the distribution channel, and therefore costs more for the TSUSAs of the world and the LGS’s to sell to the end user. Someone’s bull has to get gored in this equation, and since the margins are thin enough to begin with, those additional costs are paid by us (collectively, the shooting community).