I like the idea but I gave it a try and it's not so obvious to do the do basic math quickly with it...

I'm also a bit confused.
You say 3|13 is 0.00013
Then digitalindustry says |13 is like 1|13 which should be 0.013?
So what's 0.13 now?

And if you get 1.0098 coins (1 coin + 2|98), how do you write it in a short way?