I typically burn through 5 combined copper hammers making 1 full set of 150 luck 8 piece armor, weapon and shield set. Then 8 charges from the Forged Metal Tool to enhance them to 190. Then powder them up to 255, using the most basic reforge to obtain 150 usually leaves enough room to imbue 2-3 mods on each piece. What I shoot for is 1520 luck from the 8 pc set 70 phys fire and poison 50s-60s everything else, and as much mana increase as I can force into it. Turn in Jewl set, soles of providence, turn in luck tali, and the BT turn in robe or kimono with luck gives you another 760 and gets you to 2280 replacing the gorget with the mempo gives you another 110 for 2390 and replacing the chest with a AF brings you to 2400. Never bothered to put together 2280 suits on Siege let alone 2400 suits. But the full 2400 luck sets on prodo I have sold for 80mil - 100 mil depending on mods. Love getting modded out 150 luck clean legendaries and enhancing them to 190 those are worth small fortunes by themselves.
Just a guess for a basic 8 piece on Siege would be 10,000,000 - 20,000,000 and a free bullseye on your back every time you left your house wearing it. I typically run a 8pc 140 luck per piece for 1120 a couple of 100-150 loot jewels and a robe of the eclipse and a blessed turn in luck tali which gets you 1500+ and toss in a whole hour of the statue and you are over 2k which seems to be where the real tip in the luck variables comes into play. If we had the Fel bonus on Siege The 3150 with statue + 1000 fel from what I understand hit the max luck cap and I do notice a lot better loot on average Most notable Clean legendary items run about 1 out of 4-5 clean with max luck VS 1 out 15-18 with 2500 or less.
Again I don't know what they would be worth on Siege and my 10,000,000- 20,000,000 is just a guess.