yes, cost will definitely be a factor, i am now running a $50 a week habit, with the fed ex guy already pretty much knowing what it is. i've been in diapers daily for years now, (never was much of a bedwetter) and have been 24/7 for the past month, when my bladder finally shrunk down to about 4~8 ounces, i find myself much happier than the good old days when i had the 50oz bladder and required catheterization on too regular a basis.
If you do what pojo said its still impossible to become incontinent. The reason is your body will hold the urine and fecal in at night time. There is a reason why Animals and humans can be potty trained its a self defense mechanism. Its naturally a part of us and we were either evolved/designed to be potty trained.By going whenever you get an urge...Don't hold it...It can take over a year though, but that's like the only "safe" way