How often are people doing this? Most are looking to cellar because they want to taste how their beer has changed (hopefully for the better), but I know I've put away a handful of bottles for the sole purpose of their increase in value (again hopefully) over time. My goal for them is to be able to trade for more valuable brews down the road. Who else is doing this and what are you investing in? And how substantial of an investment in terms of number of bottles?