I have a guideline that, if something produces one sale per year and costs less than my profit for that sale, then it may well be worth doing. In fact, that's part of my formula for marketing success: try everything you've learned about and that you can make up. I promote in many different ways; there's no one major method that most of my hits come from. And I'm always experimenting. (Good thing, because things keep changing online.)
But I have another guideline:
Of methods that are worth doing, do those that produce most amount of net profit using least amount of my time. (Just too brilliant for words, isn't it?)
And that's why you should hire a maid.
Success And Your Hourly Worth
What is least amount of money you *want* to make, or make per week, or make whenever?
What is largest number of hours per week or whenever you are willing to devote to earning that?
Divide your answer to first question by your answer to second question.
(Do it. Really. I'm not busy -- I'll wait.)
That gives you what I'll call "your hourly worth."
Now, chances are you want to treat that number, instead, as what you wish to make. That is known not as hourly worth but as a "wish." Here's how to make that wish into a reality:
Don't treat it as a wish.
Treat it as your hourly worth. Say "This is what that hour is worth to me." Not just once, but always, for everything on which you spend time. It's should be your answer even --especially!-- when someone asks what you charge.
If you do that consistently enough, and refuse any and all alternatives and naysayers, eventually world will have no choice but to agree with you.
For example, I just bought a new computer. Do I have enough money to pay for it? Perhaps strangely, I think that question is irrelevant!