I don't get it. It seems like keeping good credit is easy. Why can't you have good credit and be wealthy?
Your credit report is really a way of automating what a bank manager would have done at some point for every customer, i.e examine your finances, references, legal history, etc.
It's really just a model for consumer creditworthiness of someone earning under the 95% percentile of wealth. As it's needlessly laborious for a bank manager to examine you in depth for a $5'000 dollar credit card.
Credit scores are not a factor in nearly any big loan. One might be utilising most of their available credit (as their limit is low), or have failed a few hard searches. In the case of a big loan like a mortgage, it's not so automated and is worth digging deeper.
When you're rich, every loan is a big loan - and it's worth the bank's time determining how much they should lend to you on a case by case basis.
So for example I wouldn't describe myself as wealthy but I'm comfortable. I don't like debt. So, CRAs see only the faintest shadow of me. For you I've just logged into an account to see the Equifax data for myself.
Equifax scores me 459/700. It knows I exist (because I have registered to vote and I pay tax) and it knows I have a mobile telephone contract. It has no idea I have a credit card (I do, though it automatically pays off the balance every month) and of course it has no idea I own a home, since I did not take out debt to purchase it, nor does it have any idea that I don't currently have a job.
459 isn't terrible, but it's not great even though I'd actually be a completely safe risk for even a relatively large credit purchase such as a yacht or small house. It has no insight into that, so it can't judge.
(there are of course exceptions to this, there are rich people bad with money or who want to look like they're richer than they actually are, but in general rich people stay rich by being smart about their money)
They indeed tend to not by thinks on rates, so not to much "uplift" in your scores.
People which are wealthy tend to also try to get higher credits (for it to be worth it) and buy more expensive thinks so if they messup it's often much more expensive for banks.
Not all people can handle money so there are a bunch of people which will never stay wealthy. Combined with the point above => higher rise.
Some care less for penalties when paying late and might "optimize" payments in ways which are not always mean on time/good for the score.
Lastly there are a bunch of wealthy people which optimized there business so that they only earn as much money as they need. They can always increase it but the banks can't trust this so the only see a person which might have problems paying back. (Note that not all of this people do illegal or unmoralic practices, some just only work as much as they need and not any bit more).
Lastly there is a simple question:
What does it mean if a rich/wealthy person _needs_ a credit?
(Btw. it's a different matter if it's not a private credit but for a company.)
Some of the cheapest people I know are wealthy. Cheap as in, they negotiate the hardest for the lowest price, even though it is meaningless to them. I have been told out right on more than one occasion that it's not about trying to make something affordable, but more of the shear enjoyment of making someone else take less just because they can.
In the rare case where for some compliance reason they must have a more direct link to the asset, they’ll transfer the item to a holding entity (in which they have indirect but controlling interest) and then lease it back.
If the unthinkable occurs and a very wealthy person commits to actually buying something directly themselves by mistake, they (or rather, their staff) will demand delivery before payment and then either stiff you on the bill or pay at most 70% of it, six to eighteen months later.
These are practices established centuries ago by the British aristocracy and remain alive today.