This could be a dumb question, but is the SPS system disposable? I was reading another thread where someone mentioned they don't ask for the system back, they simply add the cost of it into the price of each cake. I was under the impression it's re-useable. I guess it's decorator's choice? I would think that could easily add $50 onto the price of a cake depending on how many tiers you need. I guess I'm curious what everyone else does!