There is no official figure on the development costs of the 1st destiny game. TW3 was cheaper than the other 2 sure, but it was still way more than $15 million.
You probably shouldn't assume reddit posts contain actual data. Do some research yourself please and then maybe you will stop posting misinformation.
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Witcher 3 was about 67 million total. 32 on develoment, 35 on marketing.