Nothing is wrong with your services here but there is one matter of fact that people will focus on the thing that if you could predict that with 80% of accuracy then why not use it your self and just get rich through the night!
Thats what you mentioned in your post above. People here want services which will make them trust it at the very first time and not just predict things, and get confused with it.
The confusion? How great is that you have algorithm to predict the correct prices but still you are here hawking for the pennies in exchange with that service above! This will create bad loop in everyone's head I tell you!
People won't spend money because they trust on the systems which are in place since old times, which are socially popular and are in the discussion everyday. You may struggle a lot with that one.
I would suggest you to create free services initial, may be a website or something where you predict the prices everyday and then you match the thing with everyday real time data. If people start recognising your site then you can start charging for your services.
You are right and pointed the main issue with "prediction" services. If they work - why don't they just make a living out of it?
This is why most are scam or not really good at all.
Well in my case it's not that simple.
I can make a living from it, but it's risky, because to trade you need to have funds in the exchanges - which as everyone know is not very safe.
I won't put big sums in an exchange at any given time, and that makes it hard to generate big profits.
It's enough to make a living though, but that's not enough.
I was wondering if a service can generate a lot of revenue, but from people's responses there isn't a demand for it.
There is also the fun of showing people you can practically predict the future, and helping them.
So far the responses in this thread suggest it's better to just stop publishing my predictions here.
As you already stated, you yourself don't fully believe that your prediction will always be correct, because you believed that it is indeed very risky.
So what is your purpose on asking for a Fee for your prediction, that is uncertain to make a profit?
There is a speculation thread here in this forum, why don't you try and help them instead of making them pay.