Who else thinks that sports card "grading" is a scam?

If you don't get your cards graded,they aren't worth nearly the same as when they are graded.Grading physically doesn't change the card one bit,other than some rip-off company telling you what you already knew...that your card is awesome,mediocre,or that it sucks.They also way over-charge to do the grading.How did these guys muscle in on the card industry and make it so you have to have their "blessings" to have your cards considered "worthy"? Come on,I hope I'm not the only one who thinks these companies suck and over-charge.And to top it off,many of them use totally different grading systems so you have to have a chart to cross reference what each one equals to the next.Stupid man...they tick me off.