If you have a higher trade volume, then you are given a lower transaction fee. Could somebody run a few trades with himself, thus paying the double transaction fee as a way to get to the lower trading fees? I do not think it would actually help you, since the fee is not lowered by much.
What about the changeover point between fees - is it pro-rata or would you pay the entire fee for each trade?
Example:
What if your volume was 1999 btc and your fee rate was on 0.5%
Then mtgox says "if your volume is 2000+ then your rate will be 0.4%".
Then, you want to trade 1000 btc, can you trade it all at once, and pay 0.5% on 1 btc and 0.4% on 999 btc, or do you have to actually do a 1 btc trade separately first to bring down your fee rate, before proceeding to trade the other 999 btc with 0.4%?
