I use my spark points to give gifts that I couldn't afford in reality. I also give myself presents for doing a good job, I try to make sure it is something I really want, so every day there it is reminding me to save up for it. This is having your cake and eating it to.
Since you work to earn Spark Points just like any other money, you can feel good about how you spend it. Other people appreciate the thought too. Double win and easier to earn than some paychecks