I know that legit players manipulate the market all the time, and that if you were smart you'd do the same. Crying RMT in this day and age is retarded. You pay what you think the item is worth. If people don't believe an item is worth X amount of gil, then they won't buy it. If people are willing to pay more, of course people are going to increase the price on the market.

The scrolls are vital for their respective jobs. But they're not hard to get, either. You can either be a buyer or a seller. If you think you're getting ripped off by the sellers, then stop being a buyer and go do the KCNM and WoE yourself.