Spearhead, these guys have a lot of volatility. Let's use your pump and dump example. Timothy Sykes was regarded as the pump and dump champion. Claims he set a world record for returns. Then launched a hedge fund. Investors "picked" him to be their horse. The hedge fund crashed and burned and was shut down. Do guys get a hot hand from time to time? Sure. But I can tell you that by the time you notice their hot hand, it's probably cold. Empirical evidence shows this time and time again. In fact, Jack Schwager in his brilliant book showed empirical evidence that the optimal strategy was betting on the losers!!!! And he has the data to back it up. He said buying the losers among CTA's with a minimum track record, say 5 years, was the best performing strategy. Read his book. I highly recommend it.
The problem with P&D is that it doesn't scale well. It's also highly lucrative to the point where you wouldn't necessarily want to share that edge with managed funds. Mainly, it doesn't scale and generally pumper has enough $$ to take full advantage of pump. I don't know details of Tim Sykes' personal finances, but my impression is that he caught the internet wave, publicized himself real well, built up a small HF but wasn't a particularly good trader. I'd actually be curious how much he makes trading these days vs. educating. He's a great marketer that's for sure.