On the other hand, I would say that the price of a number of these D1-based RISC-V boards are now within the range of a Pi Zero plus lunch at McDonalds, so if you only want one of them the price difference is basically irrelevant.
A year ago a Pi 3 equivalent RISC-V board (the HiFive Unmatched) cost $665, which was a big drop from 2008's HiFive Unleashed plus MicroSemi expansion board for $2998 total. Since December there's been the VisionFive for about $180 (although with only 2 cores not 4). In a few months there will be the newly-announced Pine64 Star64 with an expected price of $60 with 4 GB RAM or $80 with 8 GB RAM (they've said "about the same price and performance as the Quartz64")
That's pretty rapid price drops.
RISC-V SBCs with considerably better performance than a Pi 4 (similar to the RK3588 boards that just came out a couple of months ago) will be demonstrated working in the next couple of months and probably shipping early next year. They will, again, probably be quite expensive at first, but existing is the hard part. Price is then just a matter of mass production economics.