I know, problem is all these sites use data services like OPTA for example which is fine if you are in the top 4 leagues, when you're in non league that data becomes less available and it is hit and miss if what you get is right or not.
I started notts county stats as a bit of a hobby thinking I could just link my site to data streams but it just isn't possible at our level without serious interest. I now spend about 6 hours a week doing nothing but updating datasets, stats and charts to ensure the stats I provide on Notts are as accurate as possible, but even then I often make mistakes, which I'm happy for people to pull me up on when it happens but in general it's a bleddy nightmare!