Hi
Wine investment is not difficult to understand. Basic rule - Supply
vs Demand. If you are thinking of go onboard, MUST go for French
Bordeaux wines such as the First Growths and some selected
super-second growths. Take note that New World wines are NOT for
investment.
Ps. the wine market and industry said so, not I say.
One company that deals only in French Bordeaux wines is Premium
Liquid Assets.
There is alot of info about these wines and too much to type it
out. 
If want to know more, can email me at: [email protected]