I agree we could use more slots, but i woul make it the same number no matter what the size is. No need to limit the majority because they couldnt/didnt want to get a bigger house. All houses have 7 slots could work for statics but would leave no room for anybody else.
Also would love it if alts could share the house as has been suggested many times before.

I am curious as to what technical reason there is to not having more slots.