On the damage discussion, I think by the end of 2013 the cap will have raised to 99mil, 50mil is kind of an odd place to stop.
For the questions:
Spoiler
What is the class of your main character?
Dual Blade, but Thieves in general
Q1. Do you think the balance between classes in MapleStory is appropriate?
No, it is absolutely not.
Q2. For which level range should level up content be added?
Lv. 221~230 (I picked this because a good level 230 map should last all the way to 250, and you can start at mobs ~20-30 levels higher than your own.)
Q3. I am satisfied with the current buying and selling system for items.
Somewhat likely. It works, but I would much prefer a system that allows people to sell items without purchasing a store permit with NX cash.
Q4. I am satisfied with the current item enchantment system (scrolls, potential, enhancement).
I'm satisfied. (I feel like this question is going to be taken as 'oh, they're not satisfied, let's add MORE ways to increase the stats of items', so I'm going with satisfied. I think bonus potential is retarded personally, and the enhancement system would be fine if superior/shielding wards were available without spending NX.
Q5. The story in MapleStory is fun and interesting.
Yes it is. (I enjoy it but I don't want to say very satisfied because they can always expand on it!)
Q6. The interface in MapleStory is familiar and convenient to use.
Yes, very much. (I love the UI for MapleStory. I'll love it even more with the expanded quickslot hotkeys.)
Q7. Please write what your most interesting moment was in MapleStory.
Huge boss expeditions from 2007-2009. Playing with 23-29 other people to defeat bosses are above all else my most enjoyable memories of MapleStory.
Q8. Please write what moment in MapleStory left you with dissatisfaction/inconvenience.
The absurd amounts of imbalance between classes. I also hate that it seems like all the classes are becoming more and more similar to each other.
Q9. Please write what should be updated in MapleStory?
HIGH LEVEL CONTENT. PQs, monster park (they've got this one down I think!), boss expeditions (THAT ALLOW MORE THAN 6 PEOPLE SERIOUSLY COME ON NEXON), quest chains, 5th job (please!), and a variety of training grounds for level 200-250.