Hi Luke,
I can't answer most of your questions, but I can tell you this.
There are far fewer collectors of the M101, E135 and E121 series cards vs T206, but there is definitely still a collector base - especially for the rare backs.
I recently saw a bunch of mid grade (PSA 4/5) M101 rare back HOFers sell for $1000 or more each on eBay (and commons with rare backs for ~$300 each), blowing away all previous sales records for those cards, so it's very cutthroat on the nicer rare backs.
I personally only own a few M101s (with the only rare back being a beat up Globe Clothing common), zero E135s, and five E121s (the series of 80s are all type 1s).
I do plan on picking up more of these, but then again, my collection is pretty diverse, so I can say that about most other pre-war and tobacco sets lol.
Best of luck!
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