Hmmm, so how did the OP come with his -0.333 threshold and is it correct? If it's not correct then the chart I sent him is useless for this.
A match play is not worth a full bet because it is surrendered on a win. The value of the match play varies depending on how you use it. For example, if you can bet a match play on a number straight up in roulette it is worth a lot more than if you play it in blackjack. Blackjack is one of the worst games you can play it on, although if you can surrender it in lieu of your bet then it becomes much more attractive.
Because the match play is surrendered on a win, it's value is roughly 50% of an actual bet. So in reality when you surrender the match play you are getting 66% of your money back, not 50%, because the value of the blackjack $5 bet is $5 but the value of the match play bet is $2.40 or w/e. So you want to surrender more aggressively, because surrender returns -.33 instead of -.5. So any hand that has ev of -.33 or lower becomes a surrender.
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