

A hundred is the Dawntrail cap and every one of the twenty-one combat jobs levels on the same ladder. The first fifty go quickly; sixty onward is expansion content at expansion pace, and ninety to a hundred is the worst stretch of the curve by a distance. The slider prices each of those bands separately rather than averaging them.
Levels belong to a job rather than to a character, so a Paladin at ninety and a Sage at one are two separate orders on the same account. The job selector on the right is where you say which, and the price follows the job you pick rather than a role average.
Nothing is desynthed, nothing is sold to a vendor and nothing is listed on the market board. There is a free extra on every order that says exactly this, and we honour it whether or not you tick it.