I agree for the most part with a LOT of the list, but a few minor quibbles stand out to me...
1. Trashing other bands in your scene isn’t hurting their rep. It’s hurting yours.
What, this isn't brain dead obvious? If you are trashing another band, or colleague of any sort, you end up hurting yourself. This should be common sense by the time children are in Jr. High...
4. Image is actually important. Cargo shorts are for dads at a barbecue. Not for musicians on stage.
Tell that to Jimmy Buffet and the Coral Reefer Band. The band has never been huge, but there is also no shortage of parrotheads out there. Yes image is important. If you wear Cargo shorts on stage, make sure you are playing cargo shorts appropriate music, in a cargo shorts appropriate venue... (Surf rock, Raggae, Drunk Country type stuff in any venue that involves Tiki huts leap to mind!). For the types of venues, and music / bands I play with and in, Cargo shorts, Hawaiian shirts, and Tevas are fitting, and appropriate. (Our last party we set up a stage literally between 2 large palm trees and we could hear seagulls between songs...)
5. Being respectful and friendly will take you much further than being superior and entitled.
In all aspects of life, not just music.
7. Your scene’s gatekeepers are friends with each other. Get in with one and you’ll get in with them all. If you piss one off, prepare to be blacklisted.
This is painfully true of pretty much every field of practice. Don't burn bridges!
10. Facebook is dying. If your entire promotional plan relies on it, you’re doomed.
That obituary is quite premature. I am not saying don't promote outside of FB, but Facebook is still valuable. Do NOT exclude it if you are trying to drive a crowd, put your presence where they are. FB is only ONE of those places... Coffee Shops, smoothie shops, book stores etc.. anywhere with a public bulletin board is a GREAT place for a promo flyer.
15. If you suck, you do not deserve to be paid. Get good first. Then you can start charging.
That's why I have never gotten paid for playing the parties I have. We have fun, the crowd has fun even though we mess up. We play with our mistakes, and even highlight them if it seems fitting... (Ever get flat out lost, or had an equipment failure in the middle of a song / set? We have, and we don't have spares enough to keep going while say I, or the guitarists swaps instruments mid song (although I have seen some other local guys do just that). We do NOT get up on stage, or practice with the intent to be perfect, or even good. We get out there, or just jam, to have fun, and to entertain. I don't think we will ever be "good", I am happy when I hear my friends, as well as their families and friends saying that "those old guys were fun!". And it happened a lot. I have recently stumbled back into contact with a local guitarist that used to jam with my old bass instructor and he wants to get back into the party jam band thing... Hopefully we can get the formula working again!
17. Go out of your way to help others in your scene. It will eventually come back around.
Just like all else in life. If you give, you will receive. Of course there are takers out there that never give back, but I firmly believe you get back out what you put in. Also something the list forgot to mention.
18. Get out of your own way. Meaning don't try doing everything all at once. Playing, sound engineering, marketing, etc... If you have friends or family that are willing to take on some aspects of running the band pass off the stuff you suck at in order to concentrate on what you don't suck at. Or at least don't suck so bad at...
For example, if I were doing the whole gigging locally outside of private parties thing and doing the marketing, I would get a friend of mine that likes doing the sound engineering stuff to do that, and would get my wife, her brother and his girlfriend to help with doing flyers etc... That way I can concentrate more on playing the music, and doing my part to keep up the show...