I agree sometimes purchasing a pattern is well worth the $$ spent. I know when I draft my own patterns one issue I always have is the yardage... if I over purchase by 1 yard to compensate for my potential calculation errors then it pretty much covers the cost of the pattern. That being said ... I do expect the pattern to be without errors. When I purchase a pattern its because I just want to get to the sew .. and not do any "figuring".