Well, most people have already stated what I think about re-casts so I won't bother to say any of my more general views on this. But I just wanted to say that I think there's a certain 'value' in having limited edition dolls and such.
I feel it's kind of... The privilege and 'pride' the artists can have in making those dolls. I don't think it's unfair if they want to make a certain doll more 'special' by limiting the number they release into the world. A lot of doll companies don't have a wide choice in the colour of their dolls. But when they DO release dolls in an unusual colour (for their individual company), don't they also tend to put more effort into giving the doll more 'character' by making them suited to be presented in that colour?
Do I still want the companies to give me more colour choices and sell more of that discontinued head? Well, yeah. I want it. But I don't think it's 'unfair' of them to create certain limits like that, and if they charge me extra because of it then I'll buy it if it's worth it and ignore it if I think they're just overcharging. For re-casting companies to disregard these choices the original companies have made, it's rather... Sad. It's not just about the money, although that's probably a pretty big portion of the 'problem'. I think it's more important to respect the pride of the artist.
tl;dr -> If re-cast companies don't like limiting the quantity of dolls and want to release them in every colour of the rainbow, they should make their own sculpts. The original artist has the privilege to do whatever they want to make their work more 'special' if they wish, and I want to respect the pride of the artist.
--(I added the following after seeing a new post when I pressed 'Preview':)--
As for the high cost of original 'big' company dolls... There is also the aspect that they charge more than needed because 'they think they're worth it' and I don't think that's necessarily a bad thing to do (don't get me wrong, I do also agree with the fact there is a slightly higher cost because they need to pay the original artist). If your dolls are much prettier and better quality than other companies, why can't you feel proud of that and get some more compensation for it? Think about a different, more common situation: If I'm more hard-working and efficient at work than other employees, I'd want to be paid more than the others who slack off. Even if my employers would gain more profit from just paying me minimum wage for doing more, I want a higher wage if I'm worth it.
EDIT: Woaaah, my post is long. Eeeh, well, I don't plan on debating further about this so please forgive me for rambling on so much in this single post.