You should be unconcerned about short-term price action when you own the securities directly, just as you were unconcerned when you owned them indirectly through BPL. I think about them as businesses, not "stocks", and if the business does all right over the long term, so will the stock.
The optimum portfolio depends on the various expectations of choices available and the degree of variance in performance which is tolerable. The greater the number of selections, the less will be the average year-to-year variation in actual versus expected results. Also, the lower will be the expected results, assuming different choices have different expectations of performance.
The range of derivatives contracts is limited only by the imagination of man (or sometimes, so it seems, madmen). Say you want to write a contract speculating on the number of twins to be born in Nebraska in 2020. No problem-at a price, you will easily find an obliging counterparty.
My net worth is the market value of holdings less the tax payable upon sale. The liability is just as real as the asset unless the value of the asset declines (ouch), the asset is given away (no comment), or I die with it. The latter course of action would appear to at least border on a Pyrrhic victory.
It makes no difference to a widow with her savings in a 5 percent passbook account whether she pays 100 percent income tax on her interest income during a period of zero inflation or pays no income tax during years of 5 percent inflation. Either way, she is 'taxed' in a manner that leaves her no real income whatsoever. Any money she spends comes right out of capital. She would find outrageous a 100 percent income tax but doesn't seem to notice that 5 percent inflation is the economic equivalent.
So some guy may know how to make money in cocoa beans, but I don't so I just let him have that. But it's got to be something I understand. It's got to be a business with fundamentally good economics. It's got to be a management that I like and trust and admire. And it's got to be a price that makes sense.
The ideal business is one that earns very high returns on capital and that keeps using lots of capital at those high returns. That becomes a compounding machine.