They may just try to sell dumb little conveniences such as extra inventory space, fantasia, or a free teleport crystal but chances are it will be glamour pieces. You might not think this is bad right now but in truth it's severely damaging to the game over time. With every glamour piece that is added to a cash shop it's 1 less added to a drop pool, crafting log or NPC vendor and that's 1 less bit of incentive you have to engage in that content. The direction of the game also tends to get greedy because players give in and buy everything. Eventually you have pieces of gear that look better than what you can earn by playing.