Having an arrow does not automatically give a sniper any sort of edge. Your damage will be next to nothing without a decent weapon. A creator only needs acid demonstration and high intelligence to do high damage on enemies, and begin to break equipment. Limitless Acid Demonstration is out of the question in my opinion, not only does this skill break armors and weapons, but stun locks enemies and forces the enemy to default neutral reducing equipment. Acid Demonstration should run out in non-command situations, just like healing items would. Otherwise, @storage is easily useable. I can't believe ANYONE here really believes people don't use creators because of the price or constant need of bottles. Arrows are easily makeable in official servers, while bottle grenades and acid bottles are not. Acid Demonstration is a luxury and dangerous in PvP type sitatuions, as the creator is 100% likely to outlast anyone's FCP as long as they live and their enemy is not another creator. Creators are in the class of professors/high wizards, highly dangerous but easily countered. In order to create balance I believe an HP boost in Tao and an increase in mammomite damage is in order, not giving them limitless access to a dangerous skill, and certainly not an unncessary price drop in supplies, it's EASY to make zeny.
Edit : I mean for god's sake, even if they were to have limitless acid demonstration, a creator without thanatos (which is many) are instantly nullified with a simply equipment change and their offensive skills aren't very powerful, if you want to make creators more widely used, diversify their offensive skills, not create limitless access to a dangerous skill.