Bad Beat Jackpots

What is the probability of Quad 8's Vs. Quad 9's and above?

Quad 8's or better vs. Straight Flush

and

Straight Flush vs. Higher Straight Flush

probability of it going down? Well, lets see. if i'm not mistaking, should look something like this: first guy's cards: 25/52*3/51 enemies's cards: 24/50*3/49 u need to come: 4/48*3/47*2/46*1/45 multiply by 2 just to simple things out, since there are 2 more cards to come. I guess this is a close estimate to the value of quads over quads: 0.0000000085 to 1 I might be wrong here, but that seems fair enough.

I have lost with quad twos before. It was against quad sevens. Was not on a bad beat table but it does happen. Although I have played a hell of a lot of hands over the years.

I had JJJJ the other day at a bad beat jackpot table and my opponent had four cards to a royal on the turn. We nearly peed ourselves, but the final flush card eluded us. At that point it was a 43:1 shot.