I'm a late-comer, and now I start to understand why many people where saying NastyMining is very well run - because it is! Admittedly I haven't looked into a lot of mining ventures, but from the ones I had a close eye on, you certainly set yourself apart for how you manage this

I personally would've let my feelings steer me away from BFL, I really dislike their behaviour, but I admit your business reasoning seems solid, and you surely have much more experience than me. So I'll keep my seats tight for the foreseeable future

Concur, Nasty mining is an outstanding operation!
EDIT: (OgN/Nona)To help with price concerns, have you perhaps considered changing how seat sales are done? Perhaps instead of storing an order book of seats for sale you store an order book of seats wanting to be purchased? This might help motivate higher prices as you change the dynamic from seat sellers competing to seat purchasers competing....