One has to really love and want the 9s in question, to buy a bunch of them seeking a 10 on a review of all of them. It also is pricey to review a bunch of expensive 9s, which one has to take into account.
So if one already has the group of 9s or genuinely wants to keep them, that's one thing. But most collectors might be hesitant to commit the resources to a cluster of examples of one expensive card, and then the additional cost of the review process. If the 10 doesn't hit, what does one then do, sell them all but one favorite, likely taking a loss with commissions and fees, if the sales are short term? Even if the 10 is hit, depending on the value, and how many 9s are in question, and their value, selling the now superfluous 9s may really eat into the profit of that 10.
In sum there are many variables, with respect to each collector's specific goals and resources.
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