The number of states has no direct bearing on the odds of winning PB/MM, which I think is the main issue. There are what...26 or 27 states/districts in PB (this argument correlates to MM also). How large are the rollovers now? In the beginning, maybe $8 or 9 million each draw, right? As the jackpot rises to $100-$200 million we start seeing rollovers of $15 or 25 million, so the pot increases at a much faster rate.
Now, for arguments sake, let's say we had twice as many states in one lottery. Initial rollovers would be around $15-20 million. Rollovers at the $100m mark would be $40 million....so we would maybe only see 8 or 9 draws to get to a record jackpot, not the current 16+ draws! Now that I think about it, that's a lot more exciting game, rather than waiting two months to build up to $200m, you could have it in a couple of weeks.
Anyhow, the number of draws would decrease, but the odds remain the same, meaning the jackpot will still climb to the same levels...UNLESS
The jackpot would climb faster at each increment, i.e. ticket sales would be greater than they are currently on each draw. So when the amount reaches any level, let's take $200m, the jackpot is less likely to be won under today's structure than with more states added.
Here's why I think so:
Jackpot Increase Today: $200m ------> $260m
Jackpot Increase with double states/players: $200m ------> $320m
And...in our story, it just so happens that the winning ticket would be purchased if the jackpot jumped to $320m, but not if it jumped to $260m. There's less of a chance the jackpot would be won on THIS hypothetical draw today, than with more states. So the rollover would be to $260m, effectively reaching a higher jackpot than the person who wins the $200m jackpot with more states. On the flip side, with more players/states, you would be reaching higher jackpots more quickly.
I'm at work, haha, and I didn't proofread this, but it makes sense in my own head so maybe it will to you too.
In conclusion I would have to welcome more states to PB and/or MM as I believe the number of players has little bearing on the size that jackpots can reach.