Steve,
You've just said you're not in competition with the NCCA, so what's the problem with being at Carpex? The hall will be crammed with companies competing with each other, surely that is the very nature of an exhibition, to showcase similar products and services in one place so that the buyer can see what's on offer under one roof.
Also, the CCDO is nothing on the scale of Carpex and will only be attended by the populations of the carpet cleaning forums and perhaps some others. You seem to have a mental block on the notion of advertising, you won't advertise CLEAN at the industry showcase, Carpex and seem to think the alternative, the CCDO will advertise it's self. It's as if you think the laws of business don't apply to CLEAN and that without spending a penny will simply come to the awareness of the carpet cleaning community by what, telepathy?
Simon