Hi Carlos,
I tend to pay close attention to where my money goes. When I first began visiting and using this resource I came to ask myself this same question. I thought to myself, as you do, I can get this stuff from other places. I did spend a little time in this deliberation and found that it can be done, but I did not find it to be easy and most importantly nearly as good a quality. I like getting this type and volume of content in one place. Its easy to use and there seems to be new tools and information constantly coming available. Honestly, the cost of this service never crosses my mind.