Is it me or are 1979 and 1980 Topps baseball wax trays drying up?

I've been following Topps wax trays for about 10 years and I'm starting to notice that the '79s and '80s--which used to be quite plentiful on ebay-- starting to be offered less. When they sell they bring over $50. (They used to sell for about $25-$30.) Yes, there was a 1980 that sold for $28 a few weeks ago but I've noticed in the last few months that when '79s and '80s are generally offered they are 1) generally buy-it-nows and 2) the buy-it-now price is up to $75-$100.
Has anyone here been buying these?
Has anyone here been buying these?
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Comments
'79's are too much of a centering crapshoot for me to open.
But I think you're spot on.
P.S. If anyone wants to purchase a 1978, 1979 tray or a 1980 tray for a very reasonable price, please feel free to PM me..
Collecting 1970s Topps baseball wax, rack and cello packs, as well as PCGS graded Half Cents, Large Cents, Two Cent pieces and Three Cent Silver pieces.
Is it just the collectibility factor of the treys?