Doug, it's absolutely fine that you were doing what you normally do and, in any event, everyone on a bike of any kind is a hero, especially in the city centre.
However, I firmly believe that this sort of event has to be representative in a way that normal people can relate to, and that means dressing for your destination.
Folk always say "I've not got a shower at work" and we have to show that that's just an excuse. If you cycle with as much exertion as a brisk walk and have luggage on your bike, not your back, you can easily cycle in your work clothes and not be sweaty at all. Every time we put a barrier up, like changing and showering, fewer people will feel inclined to cycle.
In that respect the running is interesting and shows that some folk are jolly fit, but it's not how 99.9% of people are ever going to travel into work. Cycling into work, however, is achievable by the vast majority of people. Now, lots of other things need to happen to make cycling more appealing (not least the Roseburn-Leith Walk path), but if we can do our bit with events like this that helps!
Of course, I fully admit having a major bead on in my suit by the time I got to St Andrew's Square, but I felt the need to give the boys in their lycra and on race bikes, with no bags, a run for their money! I was only 3 minutes down! The chap on the paperbike (sorry forgot your name) did a fine job at 36 mins. A nice leisurely cycling would still get you into town in 40 mins.
On that note, the challenge itself is, frankly, too far for most people (that's the population as a whole) to consider cycling. I think start points of 3 and 5 miles would be useful, and at a busier time, say leaving at 8. That would show that an unfit person in their work clothes could still easily beat a car or bus into town.