reducing item condition depreciation

[Iscah]

It should be noted that gear wears out at different rates depending on if you are in the overworld or in instanced duty -equipped gear in dungeons, trials and raids degrades at a much faster rate than normal fights out in the open world, so it may pay to get into the habit of regularly visiting a NPC repairer between duties, as otherwise it's very easy to quickly end up with badly degraded gear that will cost a small fortune to repair.

Are repairs more expensive if the gear is in worse condition, or is it a "fixed cost per percentage point restored" deal?

[Sove92]

Are repairs more expensive if the gear is in worse condition, or is it a "fixed cost per percentage point restored" deal?

It's 5 gil per percent restored for lv70 gear but the cost also considers the sub-percentage, so you can get costs like 293 gil.