4 card poker promotion math

Im playing a 4 card poker promo that pays a gas card everytime you hit trips or better. i have a 200 unit bankroll and wish to see as many hands as possible. I know the house edge is lower betting the ante but i plan to play 7 spots at once. betting 3x every hand, it is possible to lose 28 units in 7 hands. if i run bad, i could easily go broke before 200 hands, which is the minimum id see if i bet the trips and hit nothing (very unlikely).

or is my 200 unit bankroll simply to small to support this type of play? should i play fewer hands at once?

thanks