It looks like I'm going to abandon both the expensive items I've seen recently.
Comments from business people on the rabbit costume have been pretty negative. The general opinion is that the initial reaction will be good but this will rapidly turn to 'oh, another kids entertainer'. When I'm working at a trade show, this is the last thing I want to happen! I'm supposed to be attracting adults to the stand I'm working on after all.
The shells and pea trick is getting a lot of negative feedback as well. Most people think it is too long and not intimate enough. Trade shows in the USA tend to attract large crowds around a stand quite happily but the English reserve dictates otherwise. The UK audience wants one-to-one magic tricks and doesn't want to get crushed into a large group. The other drawback is the space needed to do the trick. Most of the stands I work are pretty small and I have enough trouble finding a space for my 12inch cube tale which stands on a small tripod. There is no way I am going to get a space big enough for a table to move around three large 'walnut shells'.
Back to the drawing board for me.
May the magic be with you.