I've done all three.
Category 3: This one likely contributes the most to the game/community.
I'll do this with drops and cheap purchased recipes. The yellow salvage price spike of 2020 was annoying and ended my bulk crafting efforts.
Tip: Quickfoot recipes can be bought cheap in middle level range for crafting & converting. Guaranteed to convert first time to a rare (Celerity) (sell the stealth convert the rest)
Category 2: This is the easiest one, once someone is familiar with the market and has a decent bankroll to work with.
A majority of sales I target are for around 2M and I focus on volume while minimizing the number of converters used.
I do tend to keep the good globals lotg, chance for build up, +reg, +end, etc
Tip: Adjusted Targeting enhancements can be bought cheap. Guaranteed to convert first time to a rare (Gaussian's) (just sell these)
Category 1: This is the one that makes me feel a bit shady.
Since some know the price ranges and that folks try to minimize market fees, we can put out lots of low bids and check back in a week.
Then turn around and post them at a higher price point = decent profit. Buy for 255,000 and sell for 2,000,000.
Tip: PLEASE don't sell your purples for 1 or 100 to avoid the market fees. We have cheap bids out there even if it looks safe, it's not.
Additionally, we should be able to convert Hamidon Enhancements (HamiOs, HOs, awesome sauce, proc enablers..). Just saying someone should take up the torch on this.