No, when you consider dragon doesnt give much better stats than rune it isnt worth paying the extra 16-17m.
Especially when at level 70 defense you can wear torags which is the best armour on the game for a meer 1.5mill.
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barrows cost money too :) lol
adding onto youheards post
torags is the best option for barrows armour
and tis quite cheap
Lvl 70 you say. Hmmm ok i then i guess i'll wait to splash the cash.
Might go for 60 attack now instead.
get 70 atk for whip :p