Looking at kinds != Looking at a marketplace
It gives data and that's great.
But it doesn't give buyable products IN-APP.
Discussion
That's a very good point.
A marketplace where those offering services have to list them could still integrate WoT based rankings, though.
Say nostr.wine, nostr.land, and jellyfish.land each listed their paid relays in the marketplace and the user could pay for them directly within the app. They might still find it useful to see which of them was used most by those in their WoT.
When nuanced comparisons as well? :)
The other relays you mentioned use slower relay software abd have less features.
There anywhere that performs testing of such things that could be pulled in by the marketplace? If not, that will be on the relay owner to market why their paid relay is better than the competition.