If I have one cookie I have one cookie. when that cookie is gone I have 0 cookies. The difference is one.

okay so, the difference in the number of tickets you are holding is only one. but the rate of change between your odds of winning with a ticket and without is infinite. or undefined. If, once every 10 years or so the lottery people picked a name at random without requireing anyone to buy a ticket then the original statement is correct. if however, you need to buy a ticket to win then the increase is and infinity percent.

That being said I will agree with the modification of the original statement like this

"You guys realize there's only a slight

~~ly~~ ~~better~~ chance you will win if you play

~~as opposed to if you don't,~~ right?"

Okay, thought of a better example, referencing your cookie example

If I have 0 cookies and you give my your cookie, I cookie-having-value has increased by an infinite percentage.