Here's how the bidding's gonna work I'll think of a number between 5 and 10, whoever guesses the number will get the YCH, In this case, there will be 5 rounds, in which people will guess a number

1 - a number between 5 and 10

2 - a number between 6 and 13

3 - a number between 5 and 15

4 - a number between 7 and 14

5 - a number between 9 and 18