My better half and I just put it all in one pot regardless of wether she or I earn more on any given month, after the bills etc are paid if we want anything as long as we can afford it we just carry on and get it, if not we save together until we have enough for whatever it is either of us is after, we have had this arrangement for about 20 years now and it works for us (we share everything) however some of my friends are completely opposite and what they have is theirs, what their partners have is their partners, each to their own I suppose but I like my current arrangement as it works for me and the Mrs, we don't keep count of who's turn it is for treats etc we just seem to have found a balance and we're happy this way