Everytime someone points out cheats or loopholes in the game, Squeenix is pretty quick about getting on the ball and fixing these exploits. The use of bots in fishing was probably the most common form of cheating until Squeenix made it so that wasn't feasible anymore.

The only "exploit" that I approve of that Squeenix seems to have a problem with is the FFXI windower. It's such a convenient little thing, and it boggles the mind that this is actually considered an exploit.

Also, buying gil is for lazy asshats.