I put Youtube user Kenny Stimmel's Blood Echos glitch video to the test. In a Bloodborne exploit that lets you earn over 2000 Blood Echos every 5 seconds or so. After seeing his video, I had to give it a try for myself.
Kenny has even speculated that more is to be found with this exploit and you may even be able to reach numbers over 10,000 Echos every single pass.
It should be noted that one of the main theme's in Bloodborn is brutal difficulty, and leveling way past your skill level may result in chainging the world in unforseen ways that make progression more difficult. But, hey... BLOOD ECHOS AMIRITE