I think that you need a few specialities that clients might not get at home - OWO is just one of those. So worth thinking of your overall menu to draw in customers if you take OWO off.
I went OW only about a year ago after a mild throat STI (chlamydia) - I now just use regular unflavoured condoms, usually Durex Extra Safe and change it before sex (otherwise they lack the oily lube that I need for comfortable penetration).
I did not change my prices and made as much but I did upgrade my service list to start doing A again at £50 extra. £50 puts most clients off and I end up with about 1 or at the most 2 in a week (the most I can now do without getting a sore bum
) - they have to say they want this before booking (I enema cleanse and tell them that). If I'm over my 2 in a week limit or not feeling like it, I simply tell them the situation and they have to book another time. I like having this control and you can only do this if it is an extra that needs advanced confirmation.
The one speciality that I offer without extra payment is giving WS. Where I am, this seems to be a a good speciality that draws customers and it is easier than most other services (I have a wet room shower that helps). About 1 in 4 of my clients goes for the WS option and they really like it. Much easier and safer than OWO, kissing or facials.