Often,you can buy an acceptable base sauce for less than you can make it.
The public usually thinks that your" secret sauce" recipe is what makes your bbq.
Many folks start out spending days,to express their creativity,making sauces and it can be enjoyable.
After awhile ,they often figure out that others have done this and bottled it for sale.
Experienced cooks will usually stress spending your time learning to cook the product and the sauce is merely incidental.
Take a look at several local grocery store products that sell well in your area-not because they are $0.69/bottle.
If one is close to your liking,tweak it to suit you.
Apple juice to thin.
Honey to sweeten.
Vinegar to balance out too sweet.
Cayenne to add a little back heat.
This is what comp cook teams,caterers,vendors typically do.
Actually, very few experienced cooks spend their time to make their own sauce from scratch.
Just a couple of thoughts.