$461 million in total compensation since 2007. Not sure what it was before, but private jets run between $1-90 million upfront, with hourly costs in the air of $2-12k; not sure about maintenance, but given it was co-owned, so presumably half those costs, it doesn't seem out of range. Insane, private jets in general are, but not out of range.

Because “mediocre” games sell incredibly well.

Because it was 2007: Guitar Hero and Call of Duty were huge, and Activision owned both.