To be fair to Alex, lots of DVDs do not allow you to skip the commercials (which I find equally annoying). As far as the complaint about learning gospel music, hear are my thoughts:
If you were expecting to learn recorded Gospel music, copyrights prevent this. Remember when you could find tab for just about any song? Once the RIAA started going after the web sites that hosted these files, all the websites shut down. If Alex were to perform copyrighted songs without permission, he would get sued into oblivion.
If he had used hymns, most people would have complained that they already know those songs, especially if you are a premium member of this website.
So he did the next best thing: he played riffs that represent the best of CONTEMPORARY GOSPEL MUSIC. I have seen Ty Blanchard perform many times with a house band that plays all over the PA/MD/DE area. The riffs you hear on the DVDs are the same ones he plays live. The trick is to adapt what you hear to the style of music you play. For example, on Fred Hammond's new CD, "Love Unstoppable" the track, "Thoughts of Love" has a latin bossa nova feel to it. So if you know any basslines from this genre of music, you would have no problem with picking up this song. In fact, if you learned any of the songs performed by Sade, you already know the changes on Fred's track, because they follow a similar music form.
This leads to the benefit for me: learn certain forms, then adapting them to other music styles. I may have been able to arrive at this point a different way, but being able to hear the patterns and see the fingering not only makes a better musician, but also has the advantage of planting seeds for future ideas. That is not bad for only $67, which if I understand it correctly, may barely cover the cost of a lesson.
Now if you watched the DVD's and already can play all the riffs demonstrated both flawlessly and while improvising, then you probably wasted your money. As for me, I have a ways to go to make that claim.
Ty said one thing on the video that really hit home: If you want to master your craft, find your favorite CD and learn to play all of the songs from beginning to end, then play them straight through, as though you were playing a set. We bass players scoff at this practice, but that's exactly what keyboardist (pianist specifically) must do to prove proficiency.