something of value but not something that can be traded
Sorry. My English is too poor. I can not explain that the 'value' is equal to 'something what can be traded to another person on market'.
All things that can not be traded on market ( for example, stones from Pluto ) are not 'value' by the definition.
Then you should learn that "value" does not just mean something that you can sell.
As stated - I might "value" the ability to send an encrypted message from my account to another account but I can't "trade this value" because if I did then I would no longer be able to have a securely encrypted message (I would have had to trust another party doing that for me which would make it basically a "useless" service).
If you can't understand this point then it isn't to do with English sorry (perhaps you fail to understand that "value" isn't a strict synonym for "money").
To perhaps try and make it easier for you to understand it would be like having someone else do your Bitcoin transactions on your behalf (i.e. defeats the entire purpose of it just like when you trust exchanges to control your private keys).