Technically it realllllly depends on ur server and what is hot and not.
If u got a small server with a small group of high end crafters, chances r ur 3 star node items won't sell as to the usual 1/2 star items.
U can be the best gatherer ever and be perfectly geared who gathers the not in demand items as to the lowly 1 star gatherer tht gathers the usual.

Imo just save ur gil and wait for 3.0 cuz honestly i'm 90% sure u can just buy ur way past the i60/70 stuff. Then u'll be like oh good thing i didnt waste gil on something tht will be obsolete in a few months.
Tht jump start may be the selling point in major updates but its 3.0 so who knows. Lucis might become vanity right from the get go.
Also have u considered ever using food buffs? Dunno lol
More of a band aod solution if ur looking soley at gearing.