I'm investing through so called mutual funds. They don't allow to invest directly in stocks, instead selling shares in portfolios of stocks. This portfolios are designed to have different levels of risk and corollary different levels of return to suit all kinds of investors. Some of this portfolios are centered on particular economy sector or particular part of global market or have particular investment strategy. The choise is really diverse. Such funds allow investors to save on brokerage commisions and enjoy market advantages of large institutional investors. While there are no gurantees of the return on investment there are strict rules in place for mutual fund managers as to what kind of operations they can perform with stocks, shielding investors from unscrupulous rip off masters.
Hedge funds, as we understand it in US, are totally different beasts. They are the least regulated invetment companies which allows them to pursuit all kinds of investment schemes. They are very risky and are open only to rich investors. They are also highly profitable, sort of.
It's state goverment that sold the lands and they do it for different reasons, some of them political. Auctions happen all the time, some years more land are sold than others. The case that I know about happened during 80s and the owner benefited from rapidly growing Florida economy and Disney World expansion.