Understand the concern on the deck cost and increased complexity with extra face cards. However, I went looking for these for my building (actually in need of painting, mostly) Star Wars collection that will have more than 52 units. Plan to use Bigger Battles. So, the simplest use is just to allow more units in a game.
As to cost, the 60 card deck is an option, not any sort of requirement. I know when I made others aware locally, they've been a bit of a hit and numerous people have already purchased such decks. I have acquired four to ensure I will have a deck in good shape for a long time to come in case they go out of production.
Cost, of course, is relative. For some, a few dollars is a big deal - I certainly remember those times in my own life, for sure - but for others it isn't so big of an issue and I'm glad to report I've got past that. Not rich and retired so new income realities but the cost of these decks - and a number of other standard count themed decks I also purchased: Yoda deck, western decks, noire deck - did not break my bank. And the themed decks were well below the 'official' themed decks costs.
As to the convenience of those themed decks, a simple oversized graphic with the relevant information makes the special element cards easy to identify. That might be a nice add to the official site, a purchasable graphic with those explanations. I saw the idea at a convention game, worked great.
As to the extra face cards and, maybe the explanatory cards, they are an easy way to add 'special events' and/or 'special hazards' to a game. Easy to add when needed, easy to omit when not needed.
So, perhaps think of the 60+ card decks as an available option - for those who find it useful.