Default Why there is not any rom development Samsung based for s4 mini?

I'm interested in this device and I was evaluating wheteher to buy it or not, but I was noticing that the development of Samsung based rom is totally absent. There are just aosp based roms (cm, Pac and so on).
Just wondering, is there any specific reason or is it only because this device has not be chosen by users deving on Samsung rooms, just by chance?

HTC Sensation Z710e- ViperS 3.1.4

Samsung Galaxy Tab 8.9 GT-P7310 - StockRom V8