I am quite certain this gives accurate guidance on the impact of how spending stat points will impact your average attack.
I won't go into detail on magic and mounts and legion damage and all that stuff, but suffice it to say that this is very well researched and if you want to do maximum damage use this guide.
Most people have crit builds (at least for the most important raids) so this assumes a crit rate of close to 100%.
This also assumes standard raid damage of 4A+1D. So Rash isn't going to be considered here.