The most successful modern wargaming company - GMT Games - has been using a preorder system (the P500) to fund its games for over a decade now. It's a very useful system for niche products - especially expensive ones, as wargames tend to be.
For the P500, you pledge to buy the game (at a reduced price). You pay no money until just before it is produced, and a couple of months later the game is mailed to you. It helps weed out the ideas that sound good but no-one actually wants to buy them.
There are miniature manufacturers who do something similar. Propose a range you'd like to see, and if sufficient people express concrete interest in buying the figures then they'll get them sculpted and cast. That's how I got my Hawaians. And the range sells normally as well.