Having broken a number of 1972 sets over the years, my normal goal is to spend around $1k for an EX-MT to NM 72 set. After listing fees, FVF, shipping costs, etc, then selling off the unsold commons in a lot, my profit is around $800-900. As far as my time. it takes me about 10 hours to scan and create the listings, then the time to ship when it sells ( I can ship on average 100 cards an hour when multiple singles are sold to one buyer, and 30 or so an hour when sold just as singles) which is probably about 15 hours total.
Having broken many sets over the years, the 72 is one of the best in regards to profit compared to original expenditure(nearly equal). Having broken other sets (61, 62, 63, 64, 66, 67), midgrade copies of these sets yield about the same profit as a 72 set, but with an original cost twice (or more) of a 72 set. For me, the 60, 65, 68 and 69 sets have the worst yield of profit versus original expenditure. However, the 70-71, and 73-76 sets all provide a decent return as compared to the original investment(not quite as good as the 72 set though).
For me, breaking sets from the 50's profitably is harder because the cards from these sets are not as liquid as the cards from the 60's and early 70s.
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