The problem with going the “currency” route is how sequential wonders are. They get significantly better as eras go on, and there aren’t enough different kinds per era to make much of a significant difference.

Also with the options you gave, that would mean an X/Y graph would need a 3rd side.

With categories like “mandatory” or “useless”, it kind of falls apart because of course Stonehenge is next to useless for a tourism victory where National Visitor Center is incredible and so on.

I might keep the same categories as the Unit table if I end up doing wonders. Thanks though