Not altogether surprising, given the number of events all chasing the same (small ) market. I gave up on Farnborough years ago, for the same reason. There are insufficient developments to maintain a fresh feel, and most of the new fibreglass ultralights seem much the same, even though they may be very good at what they do. I went to the first Aerofair, and found it rather dull, apart from landing on the hard runway with a tail-skid, which was briefly most exciting.
It might be best to get behind the PFA Rally/ Flying for Fun, and help make that a success, since that can be a trade fair but also offers much more beside.