Having followed both the threads about stall cleaning and a few others from the OP, I would say that as a consumer (i.e., the boarder) I would prefer to have a business owner who is definitive in their decisions. I would not want to be frequently asked to weigh several different options (6 days/week stall cleaning, 7, or turn out, or this...) and compare this to some potential price change. I would expect the price to be set and not changed except at my yearly contract renewal.
Starline, you have mentioned several times that your prices are very low for your area. Perhaps it would be better to determine what you think are essential needs for the horse (like daily stall cleaning if inside, or 2ce daily feeding if outside, or whatever) and then set a price based on the costs associated with care, plus a profit for you.
It is fine for you to take a profit! It sounds like you have a very nice barn. I think your boarders will thank you in the long run if you simply make a decision and stick with it.