If the primary purpose of blinds is to build pot equity for the pre-flop betting round, why are there two blinds (Small Blind and Big Blind) instead of just a one?
Would not a single blind accomplish the task of building pot equity for the players, as well as provide motivation for the blind player to participate with an otherwise unwanted hand?
Since the blind still rotates around the table to each player, each player will still be motivated to play their hand in order to recoup chips lost from the blind responsibility. If the size of the pot is a concern, the single blind could provide the equivalent value of the combined Small Blind and Big Blind.
Similarly, why have the two blinds differ (Small Blind = half Big Blind) rather than both be the same amount?