yeah thats my bad, I got through world 6 and got hit with having to pay 500 of my flower coins for the badge, exits and a wonder seed. So I was wrong.
It's kind of a pointless distinction in my opinion. I'm playing through a 100% run (not a speedrun) and haven't died or replayed any levels except for ~10 deaths in the special world levels I've done so far. Not even done with world 5, collecting every purple coin I see in my path, and I only need 1000 purple coins for the 20 remaining standees I need and the 4 post-game badges. The latter half of world 5, world 6, bowsers castle and the rest of special world will definitely give me the coins I need.
It's not really like this distinction between 100% and Wonder?% will be that big. You still need to go out of your way to collect purple coins in levels in Wonder?% cos there's >1000 coins worth of collectibles in shops you need. You can't just dash to the end of every level in Wonder?% because you need to go for every collectible anyways. The real difference between the 2 categories is just the 10 minutes you spend pressing A in the shops and needing to collect purple coins in more levels than you would in Wonder?%.
So if you want that then more power to you I guess.