It's not just about the pump and dump aspect, there is another angle to it
![Wink](https://bitcointalk.org/Smileys/default/wink.gif)
You may not know this, but these new coins are very profitable for scammers, since the only way to trade them when they first come out is on forum posts or spreadsheet exchanges. Once the coin has hit an exchange, those 'trade scammers' move onto the next coin. The mods are usually too busy to investigate the scammers so they keep scamming over and over on the same account, sometimes pulling in several $1000s worth of BTC or LTC a day.
Take this crook for example:
https://bitcointalk.org/index.php?topic=202292He was a big proponent of YAC:
Here and
hereHe was a scammer and an even bigger YAC shill. Very few people paid attention to the scam accusations thrown at him and called me a retard (and a YAC-hater
![Tongue](https://bitcointalk.org/Smileys/default/tongue.gif)
) when I first pointed it out. Some people even sent me PMs cursing me for spreading FUDge
![Cheesy](https://bitcointalk.org/Smileys/default/cheesy.gif)
The only reason people finally paid attention to his scamming was because I started hitting every YAC thread with scam accusations (which I later removed) this morning and he broke under the pressure. It may not seem like he scammed much (I'd estimate between 15-25 BTC on that account), but you have to remember that is likely only one of his many accounts.