Not sure whom you are calling trolls, but the 15 point skill cap is a fact. I had 13 WM pre big patch (yes the sacrifices armoured cav has to make is tremendous to all those with horse envy) and it gave me more wpf. I guess WM is the easiest skill to see the effects with its tangible bonus. Each point after 10 still gave wpf. I will roll a 12 ride after I retire if you want, and we could race horses versus a 10 ride, and I will leave you behind, assuming equal horses. the effects of WM above 10 are very clear and visible. I think this satisfies your curiosity? I was trying to reach that 15 point skill cap, but I wimped out and went strength. GRRR. Could have gotten 14 WM and 7 ride if I presisted a bit more and remained pure.
* oh I see. The guys saying GIGANTIC difference are kidding you. It is the same effect, except for WM I believe since higher levels of WM give (gave) slightly more points than the previous level, but the increase was barely large enough to keep up with the rising costs. Going from 9-10 ride will increase ride speed by x, going from 10-11 will increase that by another x, not some massive jump like 5x.