Im not sure if this is a BPD trait or just self obsessed consumerism... i have a impulse problem buying trinkets, talismans, stickers, patches, figurines, that best represent how I am feeling or who I feel I am in that moment in time. 
I have to display them around me to peacock my state of mind and sense of self. 

Oddly specific example; Im a 42 year old guy, married, with middle-school kids, and just bought 2 huge My Little Pony “Discord” Figures. Ive watched the show a couple times when kids were small..”ooh He looks like I feel”. 

I had to buy two for me, so I can give one to my newest FP (who doent watch the show at all) and so the other can sit in a bin in the garage. 
This happens all the time. Why??? I cant afford this quirky behavior