It actually makes tons of sense to invest in non-cash goods to trade later when there's a bust. But no matter what form your profits are in, the big risk in Madagascar (besides the cyclones) seems to be the gangs. Drivers regularly get murdered driving across territories controlled by gangs. There's really not much law enforcement to speak of and the country is insanely poor, considering all this vanilla commerce.
The vanilla trade often takes advantage of the people living in vulnerable communities and doesn't pay a living wage. If we all want ethical access to quality vanilla, we need to start asking buyers to start sourcing certified fair trade (or better) vanilla, and to work to improve the fair trade system.