My observation is a smaller vintage market of which follows less demand, lowered price. Not always the rule as it only takes one wild for that special bike, eventually and willing step up. Probably why we see a bike listed on Craigs for a few years... Lol.

I know of a few 'real storefront bike dealers' (not jippers or un-official bike biz) taking in older Dura Ace equipped trades as actual cash valuation $100. No hard feelings but they have to run a business with overhead. To compete with hobbyist flippers on Craigslist doesn't help either.

As for new, there's now many segments and a bike for specialized use. Manufacturers can rapidly design to produce efficiently and cheaply. The idea that a buyer at a bike shop will not be a one time buyer, but expect near future and add a fat tire or perhaps e-bike, gravel grinder, adventure, etc..

One dealer I know is part of an indy network and carry many top brands. The highest priced and premium race, tri bikes are a pretty good market and selling but drastically discounted, especially new stock that's one model year old.

No trades but offers the customer to consign their older bike. But those too are higher end and he won't allow common cheaper bikes to be consigned. Its a tiered arrangement so as the bike sits beyond 30-60-90 days, the percentage to the dealer increases. This keeps the floor fresh and turning.

Buyers out there might be pleasantly surprised by some real storefront dealers. That used $400 priced Dura Ace bike just might be had for a fraction of that.

The dirty and surface corrosion, tubular tire, down tube shifter bikes get tossed to the back. For those vintage treasure seekers, ALWAYS ask the dealer what 'JUNK' they might have.