Here's my tuppenn'orth:
1. Don't have nice in-jokes with the guests or the gallery, and PLEASE try and arrange your social life off-air. Yes, the audience likes a laugh as much as anyone else, but we don't want to feel ignored when we're trying to get prodcut details.
2. Remember to give accurate sizes, washing instructions and fabric composition where appropriate.
3. If products contain elements that some people may be allergic to, then be up front and say so.
4. Don't patronise: YOU have to convince the customer to watch and spend; we're honouring YOU with our presence, and not the other way around. If I wanted to be talked to as if I was retarded I'd watch party political broadcasts instead.
5. Decide what you want to be: sales assistants or "TV stars"; if it's the former, then don't go blabbing your innermost thoughts all over Twitter and Facebook. And if you do, don't have a strop if people disagree with you.
6. Don't lie. If you want people to trust you and therefore spend their cash on your channel then don't tell porkies.
7. Don't hard sell. If I want to buy a God-awful Kim&Co "creation" then that's MY decision. I don't care if you have one in every colour, or that Jimmy Krankie has been known to swan about in it: if I want to buy, then I shall. If I don't, then I won't.
8. Linked to no.6: explain in FULL how the 30 day money back guarantee actually works; on screen you make it sound so simple, but in practise it appears to be anything but. Stop treating your customer base as idiots if you want us to part with our cash in a very shaky economic period.
9. If you're going to sell food, make sure it's cooked properly in on-air shows. It's disgusting.
10. Be human. Stop it with all the "As my old nan used to say", "Jump to the phones", "Great price point" and all that malarkey. And linked to that is stop playing on the vulnerable: yes, there are people who cannot access the internet or who can't get out to shop in other ways, but that doesn't mean you take advantage of them. You know you're not their friends, so treat these people with some respect.