Im afraid it wont end well (financially) for Dave. Those "sales" end up being bought by suckers and people specializing in providing legacy support/equipment = they pay premium. It will take ages to sell all this old crap while it takes shelve space and is frozen capital.
But why is one buyer ok, and the other a sucker?
A sucker is a guy buying this because he thinks its 'vintage'
there are people that will buy older stuff, be it cars, radios, clothes, just for the sentimental value. Some stuff can be superior, but as soon as its 'vintage' you will get suckers coming out of the wood work overpaying compared to modern superior products.
The other kind are people feeding on suckers, they dont care what it is, they usually dont even know anything other than perceived sucker value of a thing. Every time you look at some old piece of garbage with ridiculous price at ham convention, car show or computer market it is being sold by those people.
In the past I dealt with this phenomenon in car, audio(mostly audiophools), and computer business. My favorite was a permanent computer market stall selling outdated, but not yet 'vintage' computers around 1993. They had Atari, Amiga, old Apple, + accessories, all listed at ~5-10x the usual price. They made 1-2 sales a day, but it was enough due to sucker prices.
Maybe Ebay turns this on its head and makes it extremely easy to sell versus meatspace. In meatspace it was always sitting on the junk waiting for right sucker.
In an auction the price is always fair because it's open bidding.
Oh how wrong you are
I highly recommend everyone listens to the whole thing.