2 things:
- Yes, they really should display rates so we can make educated guessed
- No, this isnt the equivalent of 0,78% unless you clicked 7 times in a row. If you just clicked 7 times in a time span of days/weeks, your tries were just part of a larger picture, and while yes you ve been extremely unlucky you cant claim you got the outcome corresponding to a 0,78% chance..