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There's a special event going on! Monsters are dropping special items, or you get something every time you log on, or stay on for a while! You can easily earn money from these events if you know the demand for the items! Though these are very profitable, if you don't know your servers peak times, and demand for these items, it won't work very well!
Stay On For A While Items
For example, currently, June 2009, there is an event where when you play for an hour, you get a Fun Card, which raises your attack power. If you are lucky enough to be a part of this type of event, there are a few ways to take advantage of this!
The first way is to figure out when the peak time of day for your server is. An hour or two later, open your shop, and sell these items. If the item is a good, usable item like Fun Cards, the players on at peak times may have already used them, and may want more.
The second way is to wait until the event is over, wait a couple weeks after it's end, and then sell them, most people won't have any left, and they'll be pretty rare!
For those that you get when you log on, or make a new character, you'll also need to know the how long the event goes for. Wait as long as you with them, and sell them when they're in high demand! If the event was giving out Free Azria Tickets, for example, wait a few months until the event is over, and people start buying them again, and sell, sell, sell!
For those that you get from monsters, and then trade them in for something else, a different strategy is needed. This is probably the best money-maker in this section though! These are usually pretty common drops from monsters, but people need a lot of them to make use of them. There is a very easy way to sell them! Just sell! Higher leveled people who can buy them more often will hopefully come and buy them, and maybe even ask you if you have more! The only items that I'm aware of that this won't work with are Event Sunstones, and Event Moonstones, you can't sell those...
Taking Advantage of Events
nice guide ^-^
some of these methods work better then most people thing they do but you might wanna add something like if your grinding and you get a (example Merr Suit) you can sell it in saint morning pretty easy on CW (clockworks)server for about 400-600k low to mid lvl greens for sale are found usually found in saint morning so like a flury set all together it'll sell for about 3-5m on CW..low to mid lvl greens have good bonuses and alot of the sets are used till around lvl 60+ so if you get one you wont use might as well sell it 
. Jk, just wanted to see that corrected since you say its 5m the whole set (I wish).
. Just need to be on the lookout for newly opened shops.
