Hi Matt, you have to take account of buying and selling costs as well. These costs will depend on how you buy and sell, on line or with a broker. I only use a broker. Costs go up as the number of shares, hence quantity of money, goes down. In other words there is an optimum minimum. There is also the idea of a tradable parcel of shares, below that number at certain prices you are unable to sell them on market, or buy them.
As for shares at 4c, how much money do you want to spend, and how much are you prepared to lose? Generally shares at 4c are making no money and will pay no dividend. You hope that they will announce something good, or they have something good but cannot get it going and then they get financial backing. They are a gamble and be prepared to lose it all, otherwise you might get ulcers over them. They can be fun to have if they hit the jackpot.
