Okay! OP updated using the success rate formula to get the cheapest way of leveling (on my server) at skill level 75. Spoiler: it's the 2.2 i90 stuff. ALC is SoL on this front since they don't have any ANY 2.2 i90 desynthable items. Not even housing items. BSM and CRP both have no meldable 2.2 i90 items, so they're a good bit more expensive and chancy to level at skill 75. But, the i90 stuff is still the best. Check out the numbers if you care!

I don't know other server prices, but the Hunt totally tanked the myth mat market on Faerie. No complaints here! Cheap desynth experience for me forever!