see this alot in the bagged/street truck world as well. but most of it depends on the quality of work, and the parts used. you see some guys trying to sell their stock s-10 that they bagged with a stick welder and a torch trying to sell it for $7000. when for just as much, you can buy a truck that is show quality and built by a reputable shop. then some sell for less than what it would stock. it all goes back to the owner, and how much they really know what they have, and whatever the buyer is willing to pay for it. I have seen people pay outrageous amounts for hacked up pos'es because they didn't know what they were looking at, or fed into the buyers line of bs about why it was worth so much. but these trucks only have value to a certain crod who are into them. to everyone else mods may decrease value. while to someone who is into the scene, they are willing to pay way more for it because of the work. but if you try to trade you will get absolutely nothing for it, even though you ave spent all that money making it just how you want. dealerships and non vehicle enthusiasts don't see mod values the same way we do