[68Hawk]

Drawing such a large amount of attention to yourself screams vanity rather than shady laundering to me.
If it's laundering you want to do you make the same deal in a dark room where no-one else knows about it.
Running up the price by purchasing high to 'pump' and then 'dump' your remaining stock is enormously risky.
First the attention will mean IRS attention.
Secondly, there are only a few players in that end of the market, probably no more than 2-3 in the close ball park high figure and then another 2-3 30%-50% below that.
All it takes is for the other potential buyers to see better value in a different patch or issue and leave that immediate market for the card and you're left holding merchandise worth 2-3 times what you can now get back for it.

Stuff like Lebron's 03 Exquisite patch cards, numbered to 99 or 23, have grown very organically over the last 15 years...even if that has become stratospheric in the last 12 months.
There is a large market who have the funds (in the hundreds of collectors for this exclusive issue) for his stuff and it trades consistently and regularly and higher and higher.

I think this Doncic number is far more likely a long term play by a collector or collector group who think the return in 10-15 years could be as good or better than the one made for Lebron rooks. They have the money that they aren't going to lose sleep if this card doesn't play out.
And GUARANTEED they have boat loads of cash into other players and feel good about making up with one card what they lose in another.