i think the main reason in the cost difference is in fact that indoor costs a lot more to run so people gotta make their money. but ya indoor does have the potential to be better than outdoor because there isnt any windy or rainy days, or animals (if u grow guerilla style) brushing up against ur shit knockin off crystals. also sometimes outdoor gets that what me and my boys just call that "outdoor look". u know when it just has like like yellowish tint to it, we call it sunburned weed. also indoors u can increase the co2 ppm which doesnt really make it any better quality but it allows u to feed more often. but like senor stated, its really all about strain. but i think if u took two identical cuttings and grew one indoors and one outdoors with all the nutes and everything being the same, the only difference being artificial lighting and co2, i think the indoor is going to turn out higher quality everytime. and this is coming from a die hard outdoor grower. i love growing outdoors and prefer it to indoors. but i also can accept the fact that the best indoor is gonna be better than the best outdoor. but u can grow some good outdoor and pass it off as indoors and get more money for it, like i do.