There are many competition smokers who use store bought rubs and sauces, so don't feel bad. I make my own rubs because it is cheaper, but if I knew a certain store rub delivered big flavors and wanted to do something special or different, no problem the store rub may be used straight or doctored. Same with Q sauce, I use cattlemans, if 80% of USA restaurants think cattlemans is good enough for them, why should I argue. However I always doctor it up making sweeter or hotter available for different tastes. Recently I mixed it with another bottled marinade that gave it a tropical back taste yet still had the familiar bbq sauce flavor too, works great with chicken. I tell my SMF buds what I might use, but when I am asked to cook at someone's house, I re-bottle the sauces so no one has a clue I didn't make it, plus I always take extra stuff to make it sweeter or hotter depending on what people want.