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@davewil1964 wrote:

Books sell.

 

And 1st editions or bundled relevant sets are not that common. So not a saturated market.

 

I would tweak some of the prices, but if I was selling those books, I would be charging around the same prices for most, so they are ballpark.

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To be accurate you should put the word " SOME " before " books sell. The OP has already stated that the books they have listed are simply not selling. So while some books sell, ( I know because I sell close to $1000 worth of used books on ebay every week  ) its constructive to look at why the OP's books are not moving.  The answer is simple. Its pretty hard work selling low value, modern, common titles that many other sellers have listed. ( same as selling used, common clothes  )

@davewil1964   As you mention, many first editions do sell with sought after titles worth hundreds of dollars, but like everything, they need to be the ones buyers actually want. It all comes down to rarity, subject matter and condition. Its the one percenters that bring the really good money and sell quickly. The other 99 % make great props for wonky beds or can be used for last resort loo paper in a pandemic. To make reasonable dollars per hour, book sellers need to educate themselves on how to identify the one percenter's and find reliable supplies on an ongoing basis.

Selling mass produced, common titles for a few bucks is OK if you dont place any value your time, but it is a flawed model for sellers who want to actually make any sort of return on their time and the money invested in stock.