eBay's profiting off "blood money" from Aaron Hernandez' alleged murder by allowing sellers to jack up jersey prices -- so say several New England sports memorabilia store owners ... and they REFUSE to do the same thing. As you know, prices for Hernandez jerseys on eBay have soared in light of recent events -- with some jerseys reaching $1,500 or more -- but TMZ spoke with the owners of multiple New England sports memorabilia stores ... and not ONE of them plans to raise prices to meet demand. The owner of Sportsworld USA in Saugus, MA, tells us, "We don't want to make money off this incident. It's what we consider blood money. We just want to get our money back." The owner of Your Sports Memorabilia in Boston says, "I do not stand for what he allegedly did and wouldn't want to profit off an individual who was murdered ... Sports memorabilia is a dirty industry and this is one of the reasons why." The owner of SureShot Promotions in Hanson, MA, says the store is even discounting some of the jerseys to get rid of them ASAP -- telling us, "It is a sad situation." And for the record, the demand in memorabilia stores is just as crazy as it is online ... the owner of New England Pictures (Manchester, NH) says they sold more Hernandez jerseys the day his murder charge was announced than they did in the 6 months before. Bottom line: people are really weird.