Where can you do better? It's not a 17AH battery like a power bank that has a few tens of watt hours, it has 78 18650 cells in it and over 800WH. You can get something similar from Luna for about $650 shipped:
(Link Removed - No Longer Exists) but it can't deliver as much current, doesn't come with a warranty, and comes with bare wires on the end. This is close to rock bottom from a large domestic seller.
- You will pay even more than this for a 300-400WH replacement battery (!) for a Trek or Specialized.
- From another small manufacturer, you can get a 550wh battery for $500 (https://www.radpowerbikes.com/products/radrover-battery-pack). Juiced does 420WH for $400 or 610WH for $600, i.e., everyone's about a buck a WH.
- The big ones from Juiced do cost more per WH. Panasonic 18650s aren't cheap, shipping Li Ion batteries aren't cheap, and engineering isn't cheap either. The big batteries have machined cases that the CNC'ed parts of the frame were engineered around. They tooled their own injection molded parts. Do you notice how every "shark" or "dolphin" pack looks the same? Whatever engineering costs there were for the case were paid for long ago.
Juiced seems to have attracted some customers from a niche where they see the value in more power/upgrades beyond what's available on the low end or bike shop bikes, but don't want to get into DIY. If it drives you insane that the $1000 battery only has $300 or $400 worth of cells in it, or that you're paying some employee's salaries, rent for the buildings, R&D costs - you are welcome to DIY. To be clear - I've been extremely frustrated with Juiced at times and think they really need to improve with customer service - but suggesting they are somehow gouging on these is crazy. Their prices for standard sized packs are pretty much in line with this end of the industry (not surprising, given that most of these are commodity chinese cases and manufacturing and Japanese cells). The big ones cost more, but they designed their own case and handled all the chinese manufacturing on a brand new product. If you don't see the value in it - maybe a hobbyist bike like they build over at Endless Sphere is a better fit for you. The performance on them can exceed anything Juiced or any non-bespoke manufacturer offers - you're just taking on all the R&D, safety, dealing with China, etc., costs yourself.