Slow grind vs rush to end game

[GospelVhae]

Hello,

I apologize if this has been posted for the millionth time, but I need advice. Currently I'm cross referencing the MIN and BTN levelling guides with my server's marketboard and grind the most profitable of the highest level node available. Is this the right approach or am is this a huge profit loss because there is more to be had on level 60-70 and should just grind my untouched levequests to levelup faster?

For reference, I'm very poor but very frugal with expenses. I very rarely spend more than 200k for glamour and all my expenses goes to food and pots.