Say you own a stock that is selling the same basic commodity for...

Say you own a stock that is selling the same basic commodity for a decade and there is a surge in demand that takes the price up a factor of 20. What is the rational response?
1) Smile
2) Sell the stock
3) Find something with more value

As an example of a manufacturing stock with a market cap of $400M looks like (granted they are $600M), take API (just selected as the first one in the ASX alphabetically)

Revenue $4bn
EBIT $44M
Assets $509M
Dividend 5.9%

Compare that to ANO which has:

Revenue $15M
EBIT $5M (or $1.8M if you use last audited results)
Assets $8M
Dividend 0%

I'm not saying they are not a good company or they haven't cracked the secret of baking zinc oxide. My point is they just aren't a $400M company.