Before putting our friendship before any business ventures.. first have an open mind to avoid making a reckless decision, and btw if this involves your buddy running the actual business to make the big profit then this has to raise an eyebrow because I have seen people come up with the best money making ideas not until they say they need to be the person to run the business & receive the business funds only to learn the person needed this money for some personal agendas...which is why we are advised not to mix friendship and business.

And by the way, business can sometimes be considered as gambling as you dont get to hit profits every other day , so someone telling me that its smooth sailing is hiding something or its a lure mechanism!!

For such a business proposal, am thinking it has to be something of high value and illegal stuff you dealing in, as they say that the higher the risk the better the reward...If its anything that involves an honest living expect cashflows not to be consistent.