whore this, ubersucker

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Increasing the bet size, and increasing the risk of ruin INCREASES EV. The reason? You often bust out before the WR is completed, which means less wagering on a -EV game.

Example:
Say you have a 100+100 bonus, with a $1400 WR, which has to be played on a 3% house advantage game which either doubles you up on you lose, so it doubles you 48.5% of the time.

Bet small, with say 0% risk of ruin, your EV is $100 - $42 [loss due to the game] = $58 EV

Bet $200, $400, then $800, and you will cash out $1600:
0.485*0.485*0.485 = 11.4% of the time

1600 * 11.4% = $182.53. or $82.53 EV

Thus, in this case, you gain $24.53 EV by betting big. Note that the last $800 bet here didn't increase EV at all, since then we'd have busted with the WR completed. It was just for mathematical simplicity.