Quoted from Baiter:You've got it all convoluted. At no point in time did Stern say "our pros aren't selling so let's make an even more expensive model to get guaranteed money." In fact the whole LE sales model only accelerated only when Stern was already in the black, and it was clear and the market wanted LEs.
LEs are limited for no other reason than to drive up per-unit price and initial sales due to artificial scarcity, but putting all your sales on announcement day also means less sales in the following months. Also, considering Stern is the only pinball manufacturer that officially does *not* allow pre-orders, they have no way to pre-plan guaranteed minimum sales, so that theory just doesn't hold water.
The machines (before they were called Pros) weren't selling! CSI, 24, NBA...flop flop flop...Iron Man did OK, Big Buck didn't sell that well, Avatar started slow - Then they did Tron and decided to do the LE to attract a different type of customer/market. Those 400 Trons moved pretty quickly - they never even made an official page for Tron LE on their website.
Stern doesn't do pre-orders to customers, but distributors can secure orders based on what they think demand might be. Sure, the LEs aren't guaranteed to sell out (Rolling Stones)...but most of them have all sold through to distributors. Selling to distributors = guaranteed units built/sold as far as Stern is concerned.