My friend never trained windmill or refine. Now he wishes he did.
He currently uses about 10mil worth of -cp items for windmill training.
For refine, he borrows my ~400k guild -dex set, buys himself NX production potions, tons of ores, and hopes for fails.
Just an FYI. It's a stuff ton easier and cheaper to do it earlier. They're well worth the damage increase. Windmill gives a nice amount of strength, and refine is the most AP efficient way to get dex.
Also, I made several hundred thousand gold from windmilling zombies.
Plus windmill is simply amazing when you can do a lot of damage with it.
Dragon event was pretty good, made 2.5m from 3 dustin greaves, a scale, and a dustin armor, and I'm still selling a pirate crewman that I synthed from dragon drops.
Also, after doing a few for guildies/friends, I am now able to help anyone on Mari with G3 final.