In my opinion, collecting modern material such as imperf sheets and 'errors' has a history of being a significant challenge due to speculation. While some collectors might simply just trying to collect this material, it sits inside the 'speculation marketplace'.
I think some of this are sellers who simply list things at ridiculous prices but some of it is speculating dealers and resellers. I also think that the modern issue 'speculation marketplace' has been around at least since I start in the hobby (1970s). I do not have enough information/data to be able to opine about the USPS production numbers and how it might impact sales and profit/loss.
Every market has players who offer various kinds of 'limited' items. For example I was in the market for a new Honda Civic Type R this year. I felt that this car has a lot going for it; a great handling 300 HP, 170mph car with 4 doors (and useable back seats) and a 50 cubic foot hatchback.
In other words, a super fun car to drive that is affordable and a daily driver. You would think that Honda would be selling millions, yet they intentional have limited production since 2017 and only bring in approximately 6000 per year into the US. By making them 'rare', Honda dealers use them as showroom attractions to sell the 'regular' Civics and Accords. Speculation is alive and well with Honda Civic Type Rs with used ones often selling for more than they originally sold for from the dealer. This sucks if you want one, it is a seller's market. <shrugs>
Is this a good strategy for Honda? Honda knows for sure since they have the data and the marketing experts and as a person on the outside and looking in I would not venture a guess. I feel the same way about the USPS and their stamp production and marketing decisions. Don
Some recent issues with low quantity issued numbers that are longer available from the USPS are commanding high prices in the resale market such as the Mr. Rogers (12 million printed) release in 2018. Based on the resale market, a sheet of these stamps has tripled in value since the original 2018 purchase price.
Which 2021 USPS issues do you all think will be worth triple in 3 years?