Buying packs and intentionally not using the main feature

I don't see any problem with purchasing a pack without being interested in the main feature. Every pack I own has added something fun to my game, but I don't use all the main features all the time and I will admit some interest me far more than others. If you really want something from a pack and can afford it, then I think it's worth it, at least on sale. You may even be pleasantly surprised and get more enjoyment from it than you expect.