Mine Sand Make Bottles, not the most exciting thing in the world but it is the cheap way. Use green thorns for regs, open as many clients as you can and give each toon 100 thorns. Have three of the toons with necro and a horde minion to pick the regs up. I use 8 clients open and poke 8 thorns every 2 minutes after a few hours you have many thousand of each reg and defeat that annoying 2 minute timer on thorn planting. Any bare dirt patch will do for reg farming, so just use one near your house and dump the full minions pack into a crate on the porch when they get full. Rot train other skills in 30 seconds-1 minute between cycling through the clients. Ya'll didn't think I grew those 4,320 green thorns every plant cycle to do vorpal bunnies did ya
If you don't have enough accounts to pull a lot of regs fast as a friend to help out and split the regs 2/3 :1/3 if you are supplying the thorns. Since you are attended when each toon performs a action and not running a script to do it for you, it is legal.
For necro regs farm the undead guardians at the entrance to the underworld in the hall of kings or whatever it is called and pick up some undying flesh and silver serp skins in the doing. They DROP A LOT of necro regs and are much easier to kill than liche lords.
Buy the kegs unless you like making them. I have found most buyers prefer bottles put in comod deeds over kegs, but if you are going to take that route MAKE the bottles or the expense of buying them will take a good portion of your profits.
And finally I use the heck out of pots in PvM with as much enhance potions as I can get on jewels. Greater Explosions can be quite destructive, Invis pots are priceless, greater cures are a must fighting certian critters like Yamadons that like to drop the poison on you. Handy to run greater heals and cures when T hunting as well if you take the hits from the chest. Annoying when you get over weight and don't want to drop anything so hit a greater strength to gate home. Pots are very under rated in PvM tossing greater explosions into mobs with high enhane pots is very effective. Tossing pots on pirate ships is to
and you can keep a steady stream of them flying with last object, last target macro
PvPs hate shatter pots
and a fear or tar pot can buy you the few seconds you need to escape. But yes some of us use pots like a bandit in PvM to great effect.
If you want to try the green thorn trick, I will be happy to hand a 1000 or so. I grew way more than I will ever use.