In article . com,
Jay Honeck wrote:

I think everyone was disappointed by their absence. I wonder who peed
in the warbird's Wheaties, to make them stay home with their toys?

My guess is the cost of getting to SNF and back home.
Those are the costs they themselves have to bear.
Once they get to SNF, all the fuel and oil they can burn is free.
If you don't have a sponsor to pay your bills, you have to budget for
the events you are really committed to attending.
When you are looking at 30 gallons per hour for fuel and 1/2 gallon per
hour of oil through a radial engine, todays costs are high.