> - Take some profits. Buy a new car. Better
> yet, buy your spouse a new car. Or a new
> skateboard (lower stakes players). Or invest
> in a diversified portfolio of mutual funds.
> Whatever.

This is a very risky decision because what you are doing in essence is spending away positive variance. We need to keep positive variance in with our bankroll in order to cope with negative variance. One who choses to simply spend away money from winning sessions is very apt to go broke.

> - Add the winnings to the bankroll and
> continue to play at the same stakes. This
> will have the effect of reducing risk of
> ruin.

Adding session winnings will only keep the risk of ruin consistent not reduce it in respect to "No." The only way to reduce risk of ruin is to add money to your bankroll not winnings.

Sorry for disagreeing with your conclusion of options.