Some posts violate basic economy rules and make trivial errors.. lets recap
1. for every buyer there must be a seller... and vice versa.... 1m ped esi sold means 1m ped esi purchased. MU is 1900% so 1 ped os for skill (TT Value) 19 ped is player to player... no effect on MA
2. prices are high due to two different reason (A) mayhem hunters that chip out skills to stay in lower categories (B) for some special skills there is a request (Looter and crafting maninly)
3. Biotropic is related to restoration UL chips.... skills produced are worth in TT Value more than cost to activate the chip so actually the Resto chip MANUFACTURE SKILL FOR CREDIT (yes not many know it) and biotropic sells for good value
4. ESI drop from MANY monster and are not so rare, i am a low level player and dropped 2x (one was on feffox other was from longu) but on wiki thre are many monster that have it in drop list... just rare drop.... (hint.. kill more)
5. the man that farm shraps and oils to breakeven on ammo must really be not a clever player.... the best is 102% mu... there is better over there
jsut to recap and correct some strange theories
evey already said it.. therea re 4 pages of ESI in AH.. if you lament for high price remember it when yo will drop one and try to sell for high price.... it is easy to lament for other pepople greedness....