I have a couple of different thoeries from what I have seen, based on certain observations, such as the rpice of plastic models climbing prior to the dramatic rise in oil prices.
First, there is no compelling reason to manufacture MRR stock of of virgin plastics given the enormous market in re-cycled polystyrene.
Second, I think we will find that costs from manufacturer's have climbed so much as the profit margins demanded by the hobby retailers.
I heard a list of price breakdowns for a typical product on a documentary a few days ago; the bulk of the money goes to the wholesalers and retailers, followed by the factory. The raw materials people get the smallest chunk. So - cheap plastic and cheap Chinese albor equals major profits to wholesalers and retialers, that being your LHS.
Lately, I've been trying a new tack with the LHS types: I tell them what I want, but I insist on seeing the products that offer the most value for my money. If they say they don't know which those are, I'm out the door because I know they have a very clear knowledge of their profit margin on every item they offer. OTH, if the salesperson knows his stuff, I'll do business and buy up some of the extras I wanted, too. We both win, but I won't buy something just because it "looks great", got a "great write-up in the latest issue of MRR or is the newest "must have".
Other than food, shelter, clothing and Flextrack, there are no "must haves".
