I think that 20% discount is better than you would get on any other shares and actually gives true value, especially if you enjoy the beer! I really need to get some everytime I dont and I buy at Tescos etc its actually costing me money!
I seem to remember 2016 for some reason? I think as said above its more a club than an investment for now but well worth it if you want to buy there beer, and in reality a future gamble thats free when you buy enough of the stuff!