I don’t care if you are the number one Sommelier in the world. Why would anyone pay you $25.00 to talk about a subject that has a ton of information about it and is free.
If you put together 4 Cabernet Sauvignon wines from around the world and offered them at a good price and then charged $25.00 to conduct a tasting I might support this.
Here are some free resources to learn about the most popular grape variety on the planet.