for the price, me neither.
and maybe not for the 36 batteries (seems like they are 9inseries).
I purposely avoided making such power packs despite having around MANY 18650s for 10 years now.
( to demonstrate my point of view, i use this analogy when friends praise the Tesla 18650 battery powered cars. I ask them if it is better to have 80 horses pulling their car or 8256 rabbits)
this device has what amounts to exactly 4 laptop batteries' energy (they usually have 9 cells wired 3s3p), and there is so much one can do with them.
The whole point of the original post was to demonstrate the trend.
(to me it is the case of the packaging and paraphernalia that worth more than the power source itself)
also, one should start with what he needs to power.
i think that there two points (practical uses) defining the backup power categories.
1. the ability to run a 12v fan and a 12V camper fridge
2. the ability to run an A+++ class medium sized fridge