Egg humidity

[snakesRkewl]

So is substrate less just substrate (like vermiculite) with a lot of water, a crate, and eggs that sit on the crate and above the water?

Essentially yes.

Wouldn't that create more condensation? My issue is people say you want condensation on the top, but so that it doesn't drip down. Wouldn't it naturally drip down?

You do not want condensation on the lid at all, on the sides is perfectly fine but not on the lid.
I place the 4 tiny air holes for ventilation and it works great, no condensation and with all of that water the humidity stays 90% to 95% without ever hitting 100%.
The added water means you won't have low humidity and the vent holes mean you won't have excess humidity either.
Since we changed to doing this 3 seasons ago we have yet to have any mold issues and lack of humidity is a thing of the past.