I believe the problem is that the cleaning show does not appeal to most w/c's unless they are large concerns with say office cleaning involved in the day to day .
I do no other work but windows so I do not wish to look at carpet machines , chemicals , floor scrubbers or bin wash trailers !
Mark M's show is pretty much all window related , sure there is add on stuff , but its way more tailored to the average w/c needs .
If I go to a show it will be Marks , all I want to handle is stuff from Xline, Gardiner,Exceed,Facelift,Ova8,and a few others , being as Streamline is on my doorstep I need not worry about them so much
All the above will be at Marks , not so at the Big Show !