If you want to publish a new utility to be sold, it must first be created, categorized and made public for everyone in the registry to know of it's existence.  However, in the interest of privacy, you can choose to hide the fact that you own it, so long as you publish a means of contacting you should someone else desire the utility so that they could attempt to entice you to provide it to them.  A utility created in the registry can then be published for sale.  The metrics on supply are only considered when the utility is actually published for sale, which is seperate from simply registering the utility's existence.

Every utility has some amount of charge and cost of goods allocated towards it by one or more individuals, at any given time.  A utility has one owner, and possibly 1 or more stakeholders, similar to equity in a company in today's economy that is managed through stocks.  However, it is the registry member who has the most of all members of a utility that is the owner.

You don't have to publish the intellectual property of the utility, just the category.  This helps increase competition in society by making others aware of what is being worked on, and also allows for people to invest in your utility, if you are willing to accept the partition of ownership in order to purchase your cost of goods.

The only reason you would be posting time towards a utility on the registry is if you ever intend to sell the time you put towards it.

When you purchase something, you are purchasing equity in the utility therefore either becoming a stakeholder or, if you puchase enough, the owner.  The total amount of cost of goods you own towards it (for resale purposes, which is represented as part of your cost of goods) is the amount you spent for it, not how much the vendor contributed their time towards it.