I like that quote!
Making intentional mistakes is expensive. Doubling hard 12 vs. dealer 2, for instance, has an EV of -0.254 when you hit and -0.508 when you double. Multiplying by the probabilities of the hands, you get an ΔEV of -0.00162, or -0.16%, if you intentionally did that every time. If you're playing at a 0.50% advantage, that one misplay will wipe out 1/3 of your EV.
The other problem with intentional mistakes is that you're assuming that the right play is known - which I don't think is a good assumption to make. A lot of dealers and even pit bosses don't know basic strategy. They might watch you hit soft 18 vs. dealer 9-A and think you're an idiot for playing the hands correctly!
I was once chastised by a dealer for wanting to double soft 19 vs. dealer 6 at a H17 game. The dealer called the pit boss over, who shrugged and informed me that it's my money but "the book" says to stand; I confidently declared that I am at the casino to gamble, and dammit, I'm going to gamble!

I ended up losing the hand but basically anything I did from that point on was attributed (explicitly or implicitly) to me being an adrenaline-thirsty maniac.