Although that may be the intent (to spawn more PC ARX buys) I think there's still a large numbers of players that try a CG in their Hauler or whatever and then go do something else instead. They're not grinding hours in 700t+ cargo ships. So the curve has a very long tail with the bottom 25% delivering very little compared to the rest.
Hence, the other part of my post.
The way these type of CGs usually go, your best bet is probably to deliver a heap of stuff, get into the top 25% and then see what happens.
If you drop down into the 50% or 75% group, you know it's time to dive back in.
Speaking as somebody who has, at times, found myself in the top 10 of a CG, there definitely IS a
gigantic gulf between the top 10 and top 25% and then another huge gulf between the 25% and the 50%.
Dunno if there's any public information about who did what in CGs (on Inara, perhaps?) but it seems like there are defeinitely some "CG specialists" out there and, honestly, I dunno how they find the time to make the contributions they need to get into the top 10.
Top 25% is usually a more realistic goal and, in my experience, once you get into the top 25% and then make a handful of additional contributions, you'll probably stay in the top 25%.
As you say, there's probably a lot people who just do CGs "casually", or insist on using a Cobra or Keelback because it's "their ship" so they're probably never going to trouble the top 25% but, OTOH, the launch of the PC2 means there's a
lot of people desperate to take their shiny new uber-hauler out for a test-drive.
Those people could make it quite a bit harder to score a solid top 75% spot.
The other thing is, the Credit-reward for a CG doesn't mean a lot... unless there's a big uptake for a CG (see previous point) and then, once it gets to the higher tiers, people will start to realise that a good result in the CG could actually
pay for their PC2, or it's modules.
Given that those people
have the ideal weapon for a hauling CG
and the incentive to use it, there might be more competition at the top end, which'll have the knock-on effect of stretching all the other ranks too.