I had similar concerns when I paid for Chad's Videos. I wasn't sure if it would be worth the $50 if I could get the same content for free, but I realized that few people have actually watched both to give an accurate comparison. I ended up paying the $50 and being okay with that because I knew that so many others who did well used the same videos. Since the free content is relatively new (and reportedly not as DAT-focused), I figured the videos with the paid subscription were more reputable. I second what others have said about $50 being a good investment.
Edit: Since you already paid for the subscription, I say stick with it. If the money is really a concern, you can switch to the free videos once the subscription ends and you need more review.