I would say those numbers are more a consequence than a fact.
Considering my example: I really wished GT7 was more like older GTs than like GTS. I was expecting dailies were you could race with an old tunned street car against Gr3s, that I could race with my R34 against the GTR 18 Gr3. Like we used to do in olders GTs. And I think that was PD intent considering the first dailies.
But then we got the PP system exploiters and PD reverted to only Gr1/Gr2/Gr3/Gr4 races. And this is where the "consequence" part comes.
Why PP doesnt fix those systems and use this idea? Its not because people don't want this (what those numbers may make you take as a fact). But because they see the Daily A numbers, and what happens when they put sttreet cars on Daily B and C, and think its not worth the time it would take. And a great part of why those Dailies have bad numbers is because no one wants to play them, not because they want Gr3s/Gr4s, but because the system is broken right now. No one will play a Daily with just 7 people in the lobby, that is not competitive because it mixes E to A+ players, and that doesn't allow them to use the street cars they want to use. Thats the consequence.
I won't deny that a great number of players prefer Gr1/2/3/4 cars on track circuits. But there is a also great number of players that are forced to play on those Dailies making those numbers higher than it would been if PD worked to fix the Dailies with bad numbers, but they won't as consequence of those numbers.