They aren't really reluctant to list coins or tokens, are they? I think the only condition you have to fulfill is 100k USD trading volume per day.
Many coin with less than 100k 24volume are listed. They are adding new coins all the time.
Check this:
https://imgur.com/j54z2ru
BnkToTheFuture 17k
NaPoleonX 15k
and many others on the page https://coinmarketcap.com/new/
(not appearing in the screenshot )
Even newer coins have been listed.
The only reason for not being listed, I think is "Coin Has A Lazy Team" , unfortunately.
100k daily volume is a requirement in CMC's application form at coinmarketcap.com/request , also those coins you mentioned must've had 100k daily volume before listing. so it might not be visible on coinmarketcap's charts.
Right it is only the requirement to be entered to the list. It would be good though if they cleaned up Coinmarketcap a little bit as there are coins that are beyond doubt completely dead and don't even have a working blockchain anymore.