Fair enough, you make a valid point - the timing of payments is unpredictable.  (Also, diversification of funding sources is smart.)

Unpredictable enough that I would keep a reserve and not live paycheck to paycheck blocksolve to blocksolve. Keeping a minimum balance (BTC or $) so you have funds to last the 300% block dry spell.  And I would hope that the big hashers are financially smart enough to keep reserve funds!

It really all depends on the situation, but my main point was that we need more hash!