I'm 100% on board with you - it was always about entertainment. Having fun, connecting with others similarly fun-oriented and motivated to seek it out. Showing off your creative side, being the weirdest version of yourself in public. I think his point was Burners used to be their own clean up crews. The attitude that someone else will do the cleanup is why there's a problem. The money does go there, but a lot of it lines pockets - the Man is profitable, and that's on purpose.
That's how these things happen. It's popular, there are more of us motivated weirdos making an effort to party in the desert than ever, and there's more groups than just us weirdos. We still stand out - probably even more than ever now that newcomers who just want to pay the fee and see the sites helped make the Man a well known event... but some people always want things to go back to the way they were, or a romanticized way they weren't but might have been in an ideal memory.
I compare the Man's changes to a backyard BBQ to point this out to people that don't like how it's changed. Invite your friends over, they'll all take care of their own mess. You can supply the drinks and food, they have a great time and everything is an easy cleanup at the end of the day. Next year, you have more people wanting to enjoy the BBQ. The neighbors house becomes part of the party, his friends come and they love it, despite not being anything like your friends, and everybody makes new friends. 5 years later, it's a block party people are making trips from nearby states to come see. It's huge. You can't afford to supply the beers and burgers any more. The garbage situation is beyond your ability to handle yourself, and too many people either don't clean up or can't find an empty can/bag if they want to try. You have to start charging and hiring crews to take care of this, or the city is going to shut you down.
That's the Man, how I see it anyway. Complain about the growth if you like, it changed and it can't go back to what it used to be. Embrace the newcomers, they're still awesome, they've always been different, and you don't have to dislike the differences if you don't want to.