i do year's #2 definately. anything stackable, no matter how seemingly worthless i send to a mule until i accumulate a stack, then I sell. I've made about 4m from this alone. Mind you this is all crap that sells for less than 100k/stack, rarely anything over 30k/stack. bird feathers, bat wings, crystals, etc.

I've made money in so many other ways, bc40's, ks30's, farming, nm's, ls skygil.
lately a major steady form of income for me are ABC's(Ancient Beastcoins) which drop in Limbus. I want a Boxer's Mantle and a Brutal Earring, but as long as i can sell the coins for 100k each instead, I don't see how trading 75 coins(7.5Million gil) is worth it. I've almost got literally every buyable item I could ever want for thf, so once I do, at that point I'll stop selling the coins and trade them for the mantle and earring, and maybe even some af1+1. Til then 800-1000k a week for about an hour's worth of work and a chance at homam is sooooooooo worth it. Limbus is just plain fun neway.

eventually I plan to finish taking my 55+1 bonecraft, which i haven't lvl'd in about a year and a half, to 100, but first I need to take leather to 60 and don't have the patience/time to do that atm.