This is pretty much why I stopped going to SDCC. You end up paying a TON of money just to be crammed into the convention center like a sardine and surrounded by ads for movies and TV shows that mostly have nothing to do with nerd culture.
Also, the sexual harassment against female cos-players that goes on is just awful. I got accosted by multiple creepers last time I went. And a friend of mine got chased down the street and called a "slut" when she went to the most recent SDCC by some self-described YouTube "celebrity" named Kevin Brueck (he claimed to be doing a documentary about cosplayers. We're hoping we can spread the word and get him banned from any and all future cons)
This is why I prefer the smaller conventions. SDCC seems way too big for me. The biggest con I've been to is Emerald City in Seattle and that was too much for me and I was exhausted after one day. I'll stick to the local Spokane cons
You forgot "Charge people for everything except breathing." Only because they haven't figured out how to do that. And bring in celebrities that you will never get anywhere near them or even actually see them.