I recall reading a few years ago that developing new pieces (molds) was one of the most expensive things that TLG did. I don't think that that is the case anymore. Remember the Yellow Castle set? It is still one of the best sets for it's time because it had a lot of 1 x 1 and 1 x 3 pieces and those were extremely rare at the time.
Now not only is TLG making lots of specialized parts for itself and for licensed sets, it's also making pieces specifically for the collectible minifig sets. The finla proof for me was when I bought some rock monster keychains to find that they had made a special mold for the body of the rock monster. There was a pillar inside the body to anchor the screw. If they are making a specialized mold just for a keychain that will only be in production for two years, it must be a lot cheaper to make a mold these days.
Is this a problem? ... well, yes and no.
I'm very happy to see the return of the pitchfork and the introduction of useful elements like tile 1x3, but on the other hand it can go too far the other way.
http://www.eurobricks.com/forum/index.php?showtopic=44443&st=180
look at the megablocks picture....it's true horror is not that it's megablocks, it's that this set is at least half useless, <insert that tiresome argument> pieces....and it makes BURPs look good.
Anyway, my point is that if, God forbid, TLG continues making more and more new pieces, it will start to look more and more like this.