The PFA folks tried to do promo stuff, but lucked out as it was a Sywell event. The PFA were going to take the landing fees and hand out membership forms and tickets etc, but Sywell decided they were doing the whole thing, so no marketing from the PFA. Bit of a shame that.
I'm sure Sywell would report that there was no involvement from the PFA so why should they get to do some marketing / money.
I suspect it will be similar at Wycome at the Aero Expo event which is also providing a PFA regional.
Now the PFA rally has been losing oodles of money, so this way, the PFA did not make money, used volunteers, did not pay to organise the event so in real terms, were quids in.