My two cents, for what it's worth, is that the market is somewhat saturated with product right now. Prices continue to climb, as does quality, the collecting base still seems pretty steady as those who pass on seem to be replaced at a relatively consistent rate. I think if you are selling, this would not be the market to do it in here in the US. I do believe there are other countries who are experiencing their own collecting ups and downs which might make you a little more money than you might here in the States.
Personally, I echo the sentiments of several folks here. I view the expenditures as disposable income- akin to going to the movies, the arcade, buying books, etc. The value in that equation is the extent of happiness you and others derive from the money spent. Some movies I enjoy better than others, so the money was perhaps better spent on other things. Same with toy soldiers, the "opportunity cost (ie spending money on toy soldiers versus other equity driven expenditures) is derived from the qualitative enjoyment you obtain from these items. There are folks who do enjoy the burn and turn of the toy soldier hobby- and that is fine- but for me, I do enjoy the other aspects built into the hobby of which the toy soldier is but one piece.