I do feel that there should always be a TK or two thrown in the mix, because thats what most people like to see at events, and they are just plain cool.
Having said that, I have a lot of different costumes, all of which are screen accurate. I did not create them out of comfort or price point, but just the fact that I like them and they are a part of Star Wars.
I don't have much sympathy for those poor lost soles (who are adult fans) that don't recognize a screen accurate imperial officer, or a TIE pilot, or a Snow Trooper. We're not there for those folks who have so little knowledge of Star Wars that they call TIE pilots Darth Vader & any clone Capt Rex. Those people should just go home, watch the movies, then come back and try again. We are there for those folks who jump for joy when they see a Navy Trooper, or a Tusken, or a Biker Scout and congratulate us on how accurate they look and how happy we made their kids! Of course not to mention....the kids. They love everything! ...Well usually. heh.