Everyone has an idea and no money - so jobs will be offered with promises of future riches.
They(the owners of such companies)are only thinking about making money for themselves, so they hire good brains and try to use their knowledge to enrich themselves.
Make sure you vet the company fully before you sign any contracts.
It's funny how individuals fail to run thorough checks on a company before getting in, it's probably due to the fact that their are so many good brains for a job, but very few establishments to accommodate them, so they are glad to jump into any.