For example if the chance of a collision (transaction) 9.7x10-29 how would that compare to say winning the lottery (US powerball)
Winning it 2 days in a row? Everyday for a week? Month? 700 years?
According to Wikipedia, probability of hitting the Jackpot in US powerball is 1 in 131,278,024. So the probability of you winning each and every day for more than 20 quintillion years (or 20 million trillion years) is roughly the same as finding a collision. That's about 1.5 billion times the age of our universe. If you win every second, you'll still have to win for 234 trillion years.
Flipping a coin and getting heads 1000 times in a row? or 100000 or flipping it every 10 seconds and getting heads for 6 months?
Getting heads constantly every second for a time interval that is about a trillion times the age of the universe.
EDIT: Corrected some remarks.
Jesus Christ. I figured it was something like the lottery everyday for a year, not that long.
I'm going to say that despite it being "possible" planing for it is not worth it.
Now I'm sure someone is going to come along and play Lloyd Christmas and say "So you're saying it's got a chance!"