Sort of a tangent here; but an interesting one.
I think I may be similar to Myshkin and Yomo in that I gift new alts about 200M seed money to buy all the P2W transports and goodies and then a few procs, PvPIOs, and ATOs that can be slotted early. After that they generally pay for themselves just by playing and crafting/convertng/sellng my drops.
I have 23 alts about evenly split between two accounts. All are level 50 and most are pretty much "complete" which to me means getting to +3. A few of my favorites get to be +4 to everything.
I farm and market, but not a lot of either. I tend to play new characters until somewhere between 20 - 35 and then feel the need to boost them ten levels or so they can slot out their powers. I slot attuned sets as I level so that at 50 I end up with a completed build once I slot purples (if any) and catalyze my ATOs and WinterOs. My marketing consists of selling drops and older characters put in lowball bids for unloved recipes or IOs, which then get crafted, converted and sold when I next play that character.