Side bets question

I have a question concerning side bets in Blackjack. I will make it short and to the point.

If the outcome of the side bet does not rely on the dealers hand, will the win rate per 100 rounds increase in direct proportion to the number of boxes played?

(I am not taking into account the actual blackjack play result. Just the side bet result).

Example:

Win rate per 100 rounds betting 1 box: $120.00

In this particular example, will the win rate betting on 2 boxes be $240.00 per 100 rounds?

Thanks for your help...