Yup, the new stuff sells a lot more easily. Brifters, disc brakes, 10- or 11-speed. Over the weekend I sold a disc CAAD bike for an appropriate sum (most expensive sell price of a bike of mine by 2x) with just a bit of margin for all my troubles to get that thing built and running. Thought it would languish online for a while, but it was only up a week. Big frame, too.
The early millennium bikes with brifters (road, primarily) are now in their "outdated bikes" phase on their way quickly to "just old bikes" (1990s, 1980s). Those bikes, if refurbished, 'sit' on a brifter-ized '80s bike price-wise, so around the $400-600 range it's a bit packed. And low level new / few years old entry level road stuff is also quite near in price. Lots of compression. I suppose my accidentally-advantageous differentiator is the fact that my tall bikes fit properly tall people and aren't some "XL 58cm" fake-stretched up to 64cm or something, as was the case of a lot of bikes from the mid-'90s through ~2010 it seems. What a desert for us tall people, especially the '90s. So back to the '80s and '70s I happily go!