I think it is generally used when you are taking more teams than the format can support as a way to get more money. That way it does stay on the super tight schedule they made.
This happens with everything. My 14 year-old has to go to physical therapy to increase her core due for dance. Competitive dance is pretty much year round.
If you are travel sign the team up for other things as condition...by Other things I am mean rec versions like bowling, indoor soccer...
When discussing when and how umps are paid you might be ignoring the elephant in the room. Bi-weekly pay is generally 199ed. Paid at the tourney is general a check or cash. It boils down to some if they are going to report it or not. One system pretty much guarantees it and generally that is...