Now, that does beg the question as to whether WWE did it to drive the price up, because I cannot see where a $40m valuation for a promotion that the parent company paid less than a quarter of that sum for, which had to go on hiatus because it wasn't financially viable, didn't have a roster because they were released and worked on a freelance basis, wouldn't have a TV deal, or any distribution.
It wouldn't surprise me if WWE heard that Tony Khan, (not AEW, it's fully owned by Tony) was looking to buy ROH, and they said "We'll give you this much for it" so Sinclair say "Well, WWE just gave us an offer..." and Tony dipped into his inheritence a little more.
As an entity, it's a smart purchase, but I can't see where a valuation of nearly 10 times that of WCW's (when adjusted for inflation) comes from. The only thing I can really think of is debt repayment, but I don't know how much ROH owed.