[dylan604]

At some point you have to do the math. Is +$25 for the extra leg room worth it for a 3 hour flight? 6 hour flight?

I flew from DFW to Sydney on a flight that was not fully booked. They made an announcement for a $150 upgrade to have an entire row to yourself. Once in the air, all of the armrests could be raised to allow you to lay flat. $150/17hours ~= $9/hour for a comfortable-ish sleep on a long haul flight. That's better math than the app subscription model threads have.