You are not talking about an investment here, investment is sinking money into a project from which you can't take it out easily OR quickly, many times both.
What you are talking about is simply speculative buy and cornering the market, you buy what you can cheaply and price rises because of it.
Then you persuade people that the price will stay high forever and then push it higher so that people join in the buying frenzy.
Then, as you said, is time to take your profits out, and paying money to be a mod on Cryptsy is an evidence of conspiracy, you can tell people they are idiots, because it is true, but you can't change the fact that you are a con man.