Probably Cold Steel. I've got folders, fixed blades, machetes, a tomahawk, even one of their swords. I suspect they're near the top of the list if they're not the top spot.
Condor/Imacasa rank pretty highly too. They're not real expensive on a per blade basis, but I have a LOT of their blades, like, I could probably issue a Condor or Imacasa blade to the entire military personnel of some third world countries. Traditional Filipino Weapons gets an honorable mention too. I only have 6 of their blades plus 2 staves and an sawtooth ironwood club, but each of the blades was $230-250 plus shipping, the club was around $175, and the staves were around $30 each, so even with so few it's a pretty high total.
I don't own any CRKs, no Emersons, no Busse, no midtechs, only 1 ZT, only around a dozen Spydercos, a lot of Kershaw but many of them are their China line or cheap US made ones like the Leeks...