To be serious for a moment.....I guess it all depends whether people are using them for commuting or other journeys regardless of weather, or only on sunny days.
Personally I have the Kudos King for commuting which doesn't have mudguards as standard. On wet days I was getting very wet feet, and although the rack and battery stops the spray up the back there was alot of wet and mud coming forward onto the crank area. I have now fitted a wrap round type to the rear, and a mountain style one to the front. Perhaps you could offer optional extras such as mudguards ?
On my Specialised Rock Hopper I have a seat piller mounted type to stop mud on the back, and on my Cannondale Synapse racing bike I wouldn't dream of fitting mudguards.
My Oxygen has brackets for quickly putting a front mudguard on and I have one of those easy on/off rear ones - if it remotely looks like rain they go on - if not they stay off because I think it looks better without them!
The Burisch has no bracket and I only use it in the dry.
So far this system works fine for me - but then I don't use them to commute. If I had to commute I no doubt would have a third bike with permanent mudguards - because its practical and on a Monday morning nobody give a s*** how sexy you or your bike look.