Entropia Universe money making is kinda hard to figure. It is very different from the other similar MMORPG games. There are many theories of how to profit, but most of them share one thing - you can't profit from the game company. What is meant by that? Let's say you are hunting (or mining or even crafting) and you wish to make fast money, so you sell your loot/crafted items to game trading terminal. While you can get profit by doing so in a short term (with a small chance), you will however loose in a long term. After all the game developers do need to pay they'r fees too you know - so the game is made to make money for them. So what now no way to make money realy? Not quite. You can profit in game but only if you make most of your trading with people. I mentioned markup value in my previous post - and this markup is only payed by players. You could also have a service running for other players. Most common service is trade middleman (you buy resources from hunters/miners for lower markup and sell them to crafters for higher markup). Most crafters don't wan't to bother spending they'r time buying low quantities of resources, so you that for them and make a small percentage of money invested this way. Another popular services are hair stylist or body sculptor - the person will offer to change the look of your (or say costumers) avatar. But unlike trader/middleman this service needs bigger investment in skills and materials. So it also involves money and time spent to raise skills.
What kind of service you wish to provide is completely your choice (and is only limited by market demand and your imagination).
I can still give you one last advice. Before you invest your money (be it gathered in game or deposited) be sure to check the market for the service you decided to provide. Nothing is more frustrating then investing money and having no costumers to pay you for the service you are trying to provide.
There is one more way to earn PED, but not sure it will work for 100%. That is attending free events. If you win you might get PED or some items that also have they'r value. So conclusion is the only thing you can loose is time, but also get some fun in the process :)