Found the clarification (at least, as clear as they make it).
Comes down to whether or not ATF decides whether you fit the definition of "engaged in the business"...
Q: What does “engaged in the business” mean?
The term “engaged in the business,” as applicable to a firearms dealer, is defined as a person who devotes time, attention, and labor to dealing in firearms as a regular course of trade or business with the principal objective of livelihood and profit through the repetitive purchase and resale of firearms, but such term shall not include a person who makes occasional sales, exchanges, or purchases of firearms for the enhancement of a personal collection or for a hobby, or who sells all or part of his personal collection of firearms.
[27 CFR 478.11]
So, my opinion has changed (but still, who knows...)....
Buy one crate, sell all but one of the best, once....probably OK...
Do this a few times a year, probably not...as that would constitute "repetitive".