Welcome to the Strelets Forum. Please feel free to discuss any aspect of 1/72 scale plastic figures, not simply Strelets. If you have any questions about our products then we will answer them here.
I think retailers are having to be selective (collectors also).
40+sets is not a lot when you think of the periods now covered. I am not sure whether a Zvezda set of 4 figures counts as a set as that would boost the raw statistics.
It would also be nice to see most manufacturers make and release sets that were proposed and to finish off the ranges already established.