I personally do not color my wax but I still sometimes deal with the ugly discoloration after a burn. And if I use certain FOs, my wax gets colored somewhat anyway... by the color from the oil. For me I don't use dye just because I like the minimalist approach, less is best, when it comes to ingredients added to the candle. But that's just me. I wish the wax would stay beautiful and creamy all the way down, but it doesn't do that all the time. I feel the decision to dye/not dye the wax is best decided by the vision you have for your candle line and how you are going to market it (and who you are marketing to). And obviously how it impacts the quality of your end product.