Don't know if serious, or not.
Please don't try to sell things for profit here. This is a community forum, and we like to help each other out. If you want to sell something that's in like new condition, you can generally get what you paid for it. If it's used, you're probably going to take about a 20% hit off the original price. You will also likely take a hit on the shipping cost, as it's not fair to ask people to pay your shipping AND for shipping to them.
This is not the place to try and buy something, then turn around and flip it for a tidy profit, just because it's a "limited edition" or whatever. The nice thing about the classifieds is, that if you buy something, and you aren't happy with it, you can generally sell it to someone else who might want it, while minimizing your loss. But making a profit off your fellow keyboard enthusiasts is not in the spirit of this forum.
/rant