50/50

Purchase one, ten, or wingspan tickets!  The more you buy, the less you pay per ticket!
 
What's a wingspan?  Tell the tallest person at your table to stand up and spread their arms as wide as they can.  Don't tell them why.  Just tell them it's mission-critical.  We'll sneak up behind them and stretch a ribbon of tickets from fingertip to fingertip.  THAT'S how many you get!
 
Telling your tall person to sit back down at this point is optional.  I wouldn't.
 
Winner gets 50% of the pot!