Mostly it is laziness on my part,but I suppose in some respects I don't feel comfortable with those kind of arrangements...call me a control freak if you like, but I don't like DD's or SO's. So far in my adult life I have been fortunate not to get into any financial scrapes......but I know of those who have. I have some investments and that is where the savings go....and before you ask...YES I know that I pay administration costs on those savings.
A savings account would be just too easy to access...and I have a hubby with expensive tastes
