$250 does not seem at all unreasonable even if the product consists only of high quality videos. I’ve spent $100 on good sets of videos before and was happy to do so.
I'd spend money on high quality videos (e.g. buying an egghead subscription was well worth the money a couple of years ago for me because there wasn't anything that came close to that resource at the time), but I doubt I'd really spend $250 on stuff that (at least from the subject titles + video descriptions) seems to be very general/somewhat intro level material. Then again, I don't think I'm the intended audience here :/