Just to clarify: when I say recipes, I mean base oils only.
When I started making soap... I had about 10 recipes before I found one my skin loved, but even then I kept trying different recipes - especially after opening my business (because I knew if I wanted to keep my prices stable, I would need to change recipes as costs changed, and I wouldn't always have time to test recipes for shelf storage). I think over the 6-7 years I've been soaping, I've probably tried 100 recipes. But in my business, I have...
one vegan
one non-vegan
Castile
pine tar
rebatch mechanic soap
My family has various favorite recipes that I only make for them (hubby loves salt bars, but they have no customer base for me), and a few specialty recipes that I pull out for custom orders.
But generally speaking, for selling you want to keep the recipes as simple as possible. It makes your life 1000x easier for labeling. For example, I have an aloe line that I only make for vegan soaps. When I print my labels, the only thing I need to do is change the scent name and description, check if I added clay to the soap or not (sometimes I do sometimes I don't) and add to the ingredient list and print. I use the same molds for all of my soaps, so my weights are always consistent. Same deal for my OMH line, because I always use the same oils in the same qty, I only need to change the scent name and description, check if I used clay or not, and hit the print button.
The other thing for selling is that customers will expect the soaps to perform the same regardless of the scent. And as a maker who makes a lot of soap, you will eventually lose track of which soaps have the same recipes and it can be time consuming at shows to find the same recipes in different scents. You'll be doing yourself and your customers a huge favor by keeping it as simple as possible. (I have five soap lines... and I'm starting to wonder if that's 3 soap lines too many...)