I think the jet manufacturers, as you may have guessed, have for the most part stopped doing shows like Toledo because it just does not pay, they can hit their audience much better at the jet rallies or through advertising.
The Rossi 65, had one, hated it, could never get any reliable flight out of it, would not touch one with a ten foot pole. Relaiable means being able to get up and down, say, ten times, without a deadstick...and that is MOST unlikely with any of the rossis I have owned, the 65, 81, 90. Probably why they are outnumbered 25 to 1 by OS engines. The rossi has an in flight mixture built into the carb, which is a nice feature.
Frankly...I would not go near one again. A few guys have mastered them, or at least they say they have, but I have never SEEN a DF rossi motor actually give a consistent performance at the field. On the other hand, I have seen(and had) many flights with the OS 91. Find one.