Maby BA should display it.
We keep seeing threads with people asking what to do after GGL,CCRcard and Joker2, etc. Just give them a number close to 100, a bit like the plate-spinning act, they will have to keep flying constantly to keep batting it back up.
To the OP: decent question. No idea if it affects it in any. Certainly can't remember seeing details of the method of calculation exactly and all the input fators.
However, while no dobut there are a number of high value pax who never spend an Avios, just earn them by the skip load, there must also be some who do earn a lot and spend a lot. So I certainly doubt BA would want redemptions to have any negative effect at all.