I put a buy order on an X price, lower than the last price marked on mintpal.
I see in the trade history a lot of sell order at that X price.
Why isn't it processed? There are other order before mine? I should buy at X plus something?
Don't do what the panic seller do, they feed the whales, don't be whale food. When the price starts rapidly dropping CHECK THE ORDER BOOK, the buy and sell columns, mintpal for example has them. If you see lots of 1.0 MZC sell orders and 1.0 MZC buy orders that are progressively just a hair cheaper then that means they are manipulating the prices.
Most people just look at the big letters that say "LAST PRICE" and since the website autofills that price when you go to sell it, panic people don't even check to see what QUANTITY is being offered at that new low price. If it's ONE mzc or 10 mzc......it's not the real price.
Look for someone in the sell column that is selling a bitcoin worth or half a bitcoin worth, see what price they want, that's the REAL price. If someone comes along and has two accounts open, they can just buy and sell ONE mzc coin to themselves a little cheaper each time and drive the :LAST PRICE: down, forcing panic sells,
Think about this, you are not selling back to the exchange, you are selling to another person, just like you. If you think you don't want them, what makes them want to buy the coins from you??? Because they know damn well the price will go back up, way up, so they want as many cheap coins as possible.
tl;dr don't feed the whales
hmm, he's buying ...