My system went through a stage where it was important for us to acknowledge each other by sharing gifts. I recall it was weird at first, but as we became more and more coconscious we truly wanted to give and share with each other. For us it was healing, and a part of developing greater communication and respect with one another.
I understand how it feels a little weird to buy presents for 'yourself', but for my system was it wonderful way to develop acceptance and caring for each other.

I want to add that sometimes it was really cool to buy special presents to help some insiders, like with something that we knew would be really meaningful to them. Especially for the llittle ones that had lots of trauma and never really had good things. It helped them feel safe and like someone cared about them. It was really nice to help them.
Maybe some of your people would want to give something special to someone else inside too. Its nice for the little ones that never come out in the outside world to have something special that is all their own.