To me there is a clear message in printing the letter.
The majority of kilometres completed under the Audax banner are on 100km rides.
It takes a lot of effort to write a letter, compared with just not renewing or turning up ever again.
If Audax is to grow and thrive, then people have to start somewhere.
If you spend many of your summer hours around people that do 200, 300, 400, 600, 1200 km rides, then there is a serious risk that you start to think it is normal and anything else is abnormal. Then you are more likely to put others off.