I realize that. But there's a lot more money in patent medicines than in vitamins.
I have been in the pharma business for a long time (and worked in pharma nutrition for ten years also) and I take one Centrum Silver per week, an extra few grams of folic acid every week but 3 tablets/day of vitamin D (GNC's "Vitamin D 700") as cholecalciferol. FWIW.