"Temporary" ban on ladders or photography? :dunno: You haven't made yourself clear in your statement. For one thing, I am definitely advocating against the usage of ladders at such events. There are all sorts of photographers out there, 'good' as well as 'bad'. The more considerate photogs will set up their ladders generally behind the majority of the crowd. Of course, a few inconsiderate ones will just plant their ladders anywhere they please, regardless of crowd etc. So this would create a 'ripple' effect, the photogs behind on ladders will find their view being blocked and thus will tend to shift nearer to the stage, and then result in a 'wall' blocking some of the general public's view.
I do not think it is fair to have a blanket ban on photography at such free events, be it fashion shows, cultural performances or what have you. This is a free for all show, for everyone to view and enjoy, and some people would definitely want to use their handphone cam, digicam, P&S cam, video cam to record the event for posterity if they want to. The management of the shopping centre would have to employ extra security guards/workers to run around yelling at people not to shoot the performance. Do you think the general public would be happy at being told to put away their handphones or cameras? The crowd would be lesser as a result. I remember one weekend fashion show at Paragon which totally banned any types of photography, handphone cams included, as a result the crowd was quite small.
I think the presence of photographers in the crowd definitely add to the "glamour" factor of the event and will attract more onlookers, certainly the organisers of such events would like to attract as many people to view the show as possible. Sometmes such events are organised in conjunction with stalls or booths in the vicinity selling products or services, and this would also help in pulling the crowds in and indirectly boost sales for the shops and stalls in the shopping centre itself.
In short, I think a 'blanket' ban on photography at these kind of events is unfeasible and will not work. The root cause of the problem is not just ladders, but inconsiderate and 'ugly' photographers, just these few 'black sheep' and it seems that you are indirectly pointing the finger at all photographers who shoot at such events, regardless of whether they are on ladders or not.