I have noticed many people collect T206 in many different ways (HOF'ers, Certain teams etc) and some are trying to get the entire set.
I collect it in a strange way I guess, I buy any T206 that I like, can afford and do not have with little attention to condition or rarity of the back etc. If someday I end up with 500 cards and can't afford the rest then fine I guess my set is done
I don't have as much rhyme or reason to collecting as most seem to have but I LOVE the cards and love buying em.