Clearly they want to support people modding the game, even heavily modding the game like FTB. Also in the grand scale of one company buying another company. 2.5 billion is not absurd. ESPECIALLY since it's Microsoft buying the company that makes the one of the best selling and most actively played games on Xbox Live. It means as more millions of copies are sold, the'll make that 2.5 billion back, especially if they monetize it as much as they monetize the PC version as much as they monetize console version.