Well that's my question. How many people think as you do, versus how many think that it is better to diversify?
With the emerging coins (e.g., not BTC,) you definitely want to diversify. If you can mine the emerging coins that are easier to get, then periodically stow half of them and trade the other half for BTC (if the rate isn't abnormally crazy at the time anyway) then that's probably the safest way to do it, won't necessarily make you the most though.