OK, so 25 blocks got orphaned, that's 25 times 25 BTC = 625BTC (or approx $29K at the time of the event) that miners worked hard for, and did not get paid for.
It's actually about half of that. About half of those people shouldn't have found blocks and only did because the person who should have mined the block was working on the other chain.
Think about it this way, for each block in the fork, someone mined the block in the 0.7 chain and someone mined it in the 0.8 chain. About half the time, the right person got it (because the forks merged when the work in them was roughly equal), and they still have it. About half the time, the wrong person got it and the right person lost it in an orphaned block.