I think as long as its just a card or two from the expensive packs its fine, I would never buy the big dumb ship I don't need just for C3PO, I am not paying FFGs $99 for one card and a ship no one wants to play with, If I can't proxy the card I will play else where, 1 store I go to doesn't pay enough attention to see one card.
If you don't have a card you simply play something else. That's pretty simple. It's just like I don't have enough Interceptors to fly four of them so I have to fly something else.
Now I can agree it would have been much nicer if the Advanced "fix" were coming in a less expensive Aces style pack but then there may still be complaints. The A-Wing "fix" were in an Aces box but you still saw complaints about that.