I don’t know korean laws, but it is simply illegal to sell something that doesn’t match its description:
Token => 30% XP Bonus
XP Tome => 30% XP Bonus
Both do literally never yield 30% actual bonus xp. A brave reddit soul named TheDoddler went to the trouble and explained how the system works so I will just copy/paste his work here:
Since the difference between common practice and this seems really hard to grasp for some people I decided to rewrite this part:
This discussion is not wether or not the tomes gives 30% to the letter. If you have two different XP modifiers you can buy they tend to not be multiplicative so we would have for example:
BaseXP*(1 + 0,3(tome) + 0,3(token)+0,1(teamlevel)) This is the additive variant as per usual and if you boil it down neither token nor the tome would give 30% to the letter, but something close to it. If it was like this - fair enough we wouldn’t have this discussion.
So if you come here and say “it says +30%” then check the highlighted “+” above. That is what you would expect.
If you spin this further down the road somewhere around lvl 400 a tome will end up being a 1% difference in total xp. Saying that the description is fitting would mean you are also fine with a variant that gives every mob a base XP of exactly 3 so the tome leads to 1 extra xp per kill while needing millions. Would it still be a 30% base increase? Yes it would be, but still simple deceit.
There is absolutely no way for the average customer to know that a map_modifier exists and even if there was a hint you wouldn’t know it is worth up to 11 times more than your tome, which completely voids it of its value in these cases.
Neither Tome nor Token give a hint that it is more useful to use during dungeons or at lower levels (sub 80).
This leads to people being baited into throwing away euro after euro into something that hardly helps them most of the time. The only good application is on extreme low level or during dungeon runs. (Good as in close to getting these 30%)
This puts further emphasis on the fact that the practice of using a map_modifier is not even needed. Within their very own game dungeon mobs are designed to have a high base xp instead of a lowBaseXp+humongulous_map_modifier.
To me the intend is clear as to why this mechanic is obfuscated - they would not sell the same amount of tomes/tokens if they stated 7% xp increase - which most often than not is what it boils down to.
So if you ask if I want the map_modifier to disappear I would say yes that is a solution. Make it disappear and adjust the baseXP accordingly to bring tomes closer to what they are advertised as. Are they too strong then? Probably, but that is not our problem they can adjust that aswell and then you have a product that maybe is 15% more xp, at least you get what you pay for.

