I think it's unlikely that Apple eases up on their upgrade prices any time soon. This might be partly due to corporate greed, "maximizing shareholder value," etc... pretty typical reasons, right?
But I have a theory that it's also due to current economic conditions, specifically inflation, and that's why Apple still sells computers with such little memory. By selling devices with such low specs (8gb of RAM, 256gb of storage), it means Apple doesn't raise the price of their base models by TOO much, in a time when the price of everything else keeps going up so much.
The downside of this is, of course, that it costs so much to upgrade from the "base" specs. And I think that's something that will continue for as long as current economic conditions persist. 😞