100k for a demigod too much? dont think so. Why?
You have to pay...
designer/writer- for demigod designs, play style, balance, story
artist- texture, model, rigging, modeling, animation, character design, special effects (glows etc), technical art (make things engine friendly)... each part could be done by a different artist, if the studio use this style of production. I will be shocked if all those are done by 1 person (actually, I won't be shocked, because that finished product will suck hard... unless 1 person used 3~5 years to make it), but it is possible for 1 person covering 2-3 parts (you pay these kind of people more $$$ too, but it is usually cheaper than paying 2 people instead).
voice actor- voice acting...
sound engineer/composer- special sound effect of skills etc
programmers- need to put it in the game
network programmers/engineer- put it into a patch and release it
web site programmer/artist- put it on the web site.
producers/manager- to keep production on time
executives- i think their purpose varies
PR- tell people there is this demigod
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The nitpicking part
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time- time = money
food & drink- people got to eat and drink
electric bills
equipment for the production
I said enough
Around 100k can also mean 85+k or something less exact.
To actually count exactly how much each demigod cost, I think would actually be quite difficult.
Another factor is how soon you want to finish a demigod. The sooner you want it done, the more it will cost.