Consistency forces you to have a simplicity based prior if you have a counteable set of non-overlapping hypotheses described using some finite collection of symbols (and some other minor conditions to ensure non-pathology). See prior discussion here. See also here for related issues.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.