Pump and dumps are organised by speculators who have bought a coin cheap and then pump it on twitter to get others to buy. And as others buy, they sell and liquidate their position.
The key thing to note is that by the time the pump is announced on twitter it's too late to buy without ending up a bag holder. Instead use these announcements as sell signals. Here are a number of twitter accounts that announce these pumps: Cryptsy Pumps, the pump project, equal pumps, cryptodaytrade, originalchilli and crowd whale.
Most of the coins being pumped have a low Daily Maintenance Cost because that means it only takes a few investors to move the price. If you have bought some low DMC coins, just because you saw a bargain, the way to benefit from potential pumps is to always always set a sell order. That way if a pump takes place while you are asleep or at work, you'll profit even if it only lasted five minutes.
Don't be too greedy with your sell orders. I tend to split my holding and set half to sell for a 25% gain and the rest for a 50% gain. Of course a pump might end up with a 300% gain - but it's hard to call tops, and no-one got poor taking profits. Set your sell orders for a reasonable profit and leave them alone.
If it's a coin you really believe to have long term potential, don't fret about having sell orders in place - you can always buy back later when the pump is over. (Note that once a coin starts showing true long term potential and gaining in volume, the pumps disappear because they require too much money to move the market).
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Method 1: Looking for altcoins with a big community
Method 2: Which coins are being searched for?
Method 3: Which coins are the miners about to dump?
Method 4: Which coins have an ecommerce economy?
Method 5: The Daily Maintenance Cost
Method 7: Trading Thunderclaps
Method 8: Trading Block Reward Halvings