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I have never scamed lied or cheated anyone im a blm and find it hard to farm even with my scythe
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Running a casino is fine (I believe it does not violate the TOS); wowever, please do not (advertise) spam in crowded areas (IE: Lower Jueno). Everytime I walk out of Jueno from MH, I get annonyed by the 20 lines insta-SPAM: Teleports, Casinos, AFs, Coffers Hunts, etc.
Cheating is out of the question unless you plan on leveling your beastmaster. This is a very party oriented game as you've already know.
Yes, farming is difficult for mages. However, I am a Melee Job and I hardly ever farm for gil. I usually just fish (80% of my net income), and craft ingots.