Pushes are about 70% of all hands if I remember correctly. The dealer odds of having a push card with you are 1 in 13 or 7.69%. 7.69 x 70%=5.38% rake. It looks like the house added approx. .38% to their overall take. You are trading a 5% win rake for a 5.38% push rake. Doesn't sound too bad to me.