90-100 it took you 4 million gil to gain a whole level. 100-110 4 million gets you a single synth. And that's if there are even any ingredients to buy in the first place.
90-100 you could make panther masks to get to 100, then try to make money by HQ'ing dusk gloves. 100-110 you have to skill up on today's dusk gloves.
That'd require them to make the 100-110 synthesis materials to drop from abyssea gold chests, or another equivalent. Because without flooding the market with that material, 90-100 wouldn't have gotten any easier. One could argue that it would have gotten even harder, since not only would the materials be the same price, there'd be less of them available due to lower demand for the end result.