That is correct but if it was made of Zamac I am sure I would still have it, nevertheless I still have to clean them at least once a year as there are always some dust that go into the display and that's when accidents happen. Still on the price question, it is painful to see a $60 piece shattered into pieces, today's models are not cheap.
Try dropping a £120.00 white metal model on a concrete floor just at the moment someone was getting his wallet out to pay for it!
Personally as a dealer I prefer resin, these days the detailing that can be got into a relatively "cheap" model is incredible, the likes of Spark can produce (theoretically) a much wider range because their tooling costs are lower. That's great for the collector but a pain in the backside for the dealer because we cannot possibly stock 'em all and in practice unless we order 6 months before we know it's going to be made we never get it anyway! In the UK at any rate. It's actually a quite ridiculous situation we wait for ever to get what we think will be a best seller and when it arrives several ebay sellers are selling at little more than trade. Great for the collector again but you're never going to be able to buy on the High St. anymore.