IMO lvl 47 shouldnt be allowed to join Boonddock/Vault/Ohdar Scar etc dungeons to help low level players.
Why:
1: It lowers the price of rewards, makes dungeons meaningless when low lvl people just follow maxed levels through these dungeons.
IF there ever will be auction house, only stuff sold there will be 45+ weapons and so on, because max levels can just farm low lvl dungeons to get the best items and sell them...
Also: 'This is cool dungeon, challenging for your level, you will need potions and food (<--This is where u can also make low lvl pots and food useful) but u can also ask lvl 47 run it for you and do nothing and still receive the same rewards!'
Solution:
for eg. level 10 and lvl 45 can not join the boondocks same time. Cap could be something like lvl 20 or 25 may go and help, since it aint super fast for them, but still slight challenge.
However, level 45s can join in groups or alone, if they want to camp for lesser ele flakes or try beat the speed records. Or just disable ability to join dungeons if you're 10+ levels higher than actual dungeon.
This will make actual economy for low level items, and wont make it just worthless trash and only worthy stuff will be when u reach BT/RG at 45.
TL;DR: Add 10+ cap to all dungeons, to make game more enjoyable for lower levels, creating low lvl economy and give people right to be proud of completing these dungeons.