Sometimes, to convince people, you have to re-frame the problem to fit into domains that motivate that person rather than motivate you. I saw a lot of bloggers posting ways to save money, which is all well and good as an individual, but shouldn't work too well if they are a couple. I know that as a fact because months can be spent before I buy a single article of clothing, but for my wife, money can be spent on a variety of things before the month is up. It's just different motivation system. I feel motivated spending on savings, but others might be more motivated spending on things or things that promote relationship building, like an afternoon tea in a hotel with a group of friends, or shopping trips with her friends etc.
Nothing wrong with that. It's only something wrong when you try to convince the other party ......