If you write for anything other than a hobby, then you are in business. If you are in business, you had better prioritize doing good business first and foremost. Crazy Culty Kathy Kennedy thinks that Mouse Wars doesn't have to obey the laws of business, and she's now learning the hard way that she's wrong. The video below gets into this, from a business perspective, and you can do this over your lunch break.
That's why it's here, and not at the Retreat: this is directly applicable to writing as a business. Don't fuck your writing business up like Culty Kathy fucked up Star Wars. The better indie authors already figured this out (see Nick Cole, for example), so for the rest of us it's catch-up time.