Here's a handy rule to live by, one that will guide you just as well in the physical world, as it does in Second Life.
If you suddenly think you've found an easy, quick way to make a lot of money ... please, get professional help, counseling, whatever. Get a friend to talk sense into you.
There actually is no secret that 'they' don't want you to have, other than hard work, inspiration and persistence pay off. Put in the work required, and you stand a good chance of earning. Don't, and you won't. Holding that notion in your head puts scammers, con-artists and grifters out of business.
Being presented with the notion that you can 'get rich quick' or 'make money fast' means that someone is conning you, and that person might be you.