Teambuilder Lobby Jumping Penalty

Alright, so I've been in the Teambuilder que for about 15 minutes, and I've had a complete teams worth of ADCs and Junglers cycle through about 6 times now. Player joins, plays see's we're missing an ADC/Supp, player leaves immediately. See, Teambuilder doesn't work as intended if people don't stay in a lobby.

Now we've all jumped into that lobby with a Veigar Jungle and not wanted to stay. People should be able to leave a lobby or two.

But if we can't dodge a normal game without a time penalty, why can people hop Teambuilders like it's musical chairs?