I think the comments that the market place maybe reaching saturation point are probably right on the mark.
When the Black mountain 3 Day was devised it was done so to fill a gap in the market, we simply dont have alot of multi day events here in the UK but we do have alot of single day marathons and challenges.. so when you have completed a few single day events where do you derive your challenge from next??
Cost/timing etc aside the concept which should be the same for anyone looking to organise an event is to offer the riders something different.
This is a great thread, here we have a good collection of both riders and organisers so i'm interested to see where this goes.