It takes 4 days to go from 65-70. I was leveling one Class per week and this was just doing roulettes/challenge log. You spend so little time at the level that it becomes irrelevant to buy crafted gear from 65-70. The chances of you doing relevant content is very slim since leveling tends to favor lower level dungeons and all the other roulettes are capped at 50 or 60. This is a bigger problem. The exp gain is so easy from 60-70 that even though you may be missing power it may not ever be needed.