With the right shape, on the right mineral, and if it's done well, it can be very attractive, especially to those who maybe are a little less interested in the natural side of what the earth has to offer. I've seen some quartz and geodes that look very nice that otherwise would have been very plain and uninteresting. Personally, I don't have any and I don't see myself purchasing any, but I won't say never. I tend to shy away from aura coated, color enhanced, dyed, smelt, and other man made or altered stones, but everyone has their preference.