Blackjack Bonus at Canterbury park (MSP)

[Wino67]

Canterbury downes card casino (the poker room with a small regular card casino in the back) is playing blackjack with an interesting promo that on the surface might make it a beatable game but I am having trouble with the math. Hopefully someone here will help me, and since I cant go back any time soon I don't care if everyone descends on the place.

standard hard 17 game 6 deck shoe with good penetration. table limit is 5 to 150 dollars. But here are the twists.

Suited blackjack pays 2-1
777 (21 with 3 7s) pay 2-1
678 pays 2-1
any 6 cards less 21 or less is an automatic win

also 3 black jacks in a row pays 500 dollars
each additional black jack pays 1000 dollars and 25 to every seated player

This prop costs you an additional 50 cents bet infront of your bet for up to each 25 dollars bet. So OBVIOUSLY to reduce the cost of the prop you have to play in 25 dollar increments (about a 2 percent hit at that point) Black jack effectively pays about 1.62 to 1 as a result but I am having trouble figuring out the returns on the others pay outs to figure if the bonus is a net gain or drag on the game if played at 25 dollar increments. The 6 card charlies seam to help when the count is bad as well. On the otherhand, you are capped at a 6 to 1 spread on the count.

Thanks
Wino67