I wish there was a reason for variety. I do it for roleplay kind of and to experiment with different shop types, but really it's just a money making thing (I still have 3 different shops just because it's interesting I guess). I think it'd be hard to come up with specific bonuses for each shop type, but it might encourage variety to choice. Maybe while you own a smithy you have a virtual focus point? While you own a brewery it's a virtual charm focus point? ...and while you own a pottery shop you get a... ...a uhm... hmm.... Well those first two sound cool.
Edit: Actually, that could be a trade off. Maybe shops like pottery just flat out provide more money and not a bonus. Then you don't need to come up with something for every shop type. Spitballing.
Edit: Actually, that could be a trade off. Maybe shops like pottery just flat out provide more money and not a bonus. Then you don't need to come up with something for every shop type. Spitballing.