Charlatan John Brinkley for several decades "treated" a variety of diseases by transplanting the gonads of a goat. His patients were dying (or simply throwing money away), while newspaper and radio advertisements allowed Brinkley to amass a multimillion-dollar fortune.
This means that good PR allows you to sell badly done work. But the opposite (a job well done in the absence of PR = a good fee) does not always work.
In the modern world, advertising plays a colossal role. That is why, unfortunately, many good products of excellent quality move very slowly and sluggishly. For example, it is difficult to find a more stupid and inconvenient operating system than Windows, but competent promotion, the commercial genius of Bill Gates led to the fact that it took over the world.
It's not always the best work, it sells better. It is worth remembering Coca Cola. Good lemonade, but not the best, but it sells the best thanks to advertising. So you always have to worry to know about your quality work
Usually, if you are not promoting, you get fewer clients / buyers, and / or get significantly less money for your work. Than if you promoted it correctly.
There may be exceptions, but exactly as exceptions.
Another thing is that you can be content with this amount of sales and this money. your business.
I choose to be lazy in terms of promotion (in the sense, I do not do it almost in any way).
This has its pros and cons.
It depends on what you mean by the word "lead".
Selling will always be better not the work that is better done , but the one which is better sold ) If in your understanding "Work leads" means "Work sells better", then the emphasis should be placed not on the quality of work, but on the quality of advertising and sales organization.
If "Work leads" means something different, then the answer to your question will be different.
For example, if for you it means that your work has received a prize of some kind The Main Sectoral Commission ("Nobel Prize", "Oscar", or simply the prize "The best locksmith of the Gadyukinsky village council"), then the work will receive such a prize if it best matches the concept of quality that members of this Commission have.
But this, in turn, does NOT mean that the work will be bought from you, or that your clients will like it.