What are the odds of a push in blackjack?

I was playing blackjack in Vegas this weekend and noticed an interesting side bet: any player push with the dealer pays 10:1. I never really play side bets because they are always sucker bets, bit this one intrigued me a bit since I feel as if I push around 1 in 10 times at least during a table session. Any ideas if this bet is close to 50:50?

 
 
 
 
 
 

Does blackjack bonuses increase or decrease the house edge?

I play blackjack on occasion at a local casino and they offer a bonus. You make a bet from $1-$50 and if you get any combination of 20 they pay out.
2 queen of hearts=1000:1.
Same suit and card=19:1
Same suit different cards=9:1
Any 20=4:1

My question is this…..should I play the bonus and does the bonus increase or decrease the house edge?