Physics and how much cash you would need to carry.<p>5 ticket combos per form and there are comb(69, 5) x 26 or 292,201,338 possible combinations meaning you would need to fill out 58,440,268 powerball forms (the last with only 3 combos on it).<p>At this point acquiring 58+ million forms is going to be a bit of a problem, followed by building the machine to fill out all the forms, and finally having to buy each set of tickets for $10 each (except, of course, the last form costing $6).  I am pretty sure going from place to place as they run out of ticket rolls will also make it a bit difficult.