Maybe if each one took a recursive venture coin! So you could do 2 for one quick venture, then +1 on top of the 2 for another, +2 on top plus 2 for another...

So it'd be 2 for 1, 5 for 2, 9 for 3, 14 for 4, 20 for 5, 27 for 6, 35 for 7, and 44 for 8 which is probably where it should cap out honestly. It'd be a nice dump for the thousands of venture coins that everyone has!