Don't think of them as 'jumpseats', think of them as 'cruise pilot' seats. The 380 is designed for long-haul ops only. On most 380 flights (and 74, 340, etc) their is a need for seating for up to 4 pilots per leg.

To me, I only see 1 possible seat open on most flights, and if you want to sit in that for 12+ hours, then have @ it. I'd rather have a seat in coach with the inflight entertainment system.