$250 is pretty darn steep for any blend of Nitrox. We only charge $4 a tank (up to 34% though a lot of divers choose 28% because of the depths) at Truk Stop Hotel in Chuuk and that's about as remote as you can get. Maybe the Nektons are trying to use this as a way of making a little money since their overall rates are relatively low. I worked on the Pilot for a short time and it was a real mess at the time with several serious issues. It needs a lot of work but I might actually go as a passenger if it was refitted well.
I agree that thie price is steep, especially considering that they are only providing approximately 28%. I logged nearly 3000 dives on the Pilot pre-nitrox, frequently doing 4-5 dives a day and while I am a fan of nitrox (and a nitrox instructor), I don't believe it is necessary or that it provides an extra margin of safety. In over eight years of working on the boat (before nitrox was available), I can count on one hand the number of incidents of DCS. The real question is does this slight decrease in nitrogen loading (assuming 28%) provide for "safer" dives? Based on my experience, I would say definitely not.