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I'd rework the structure a little bit. Instead of a Customers A project and a Customers project, I'd go with a Customers A folder and a Customers folder (probably would name them differently, too!), and populate them with a project per customer. Now when you look at your context lists, you're going to see individual customer names as the projects next to those actions (assuming you've got the Project column turned on, or are grouping by project). Better yet, you can focus on an individual customer, group of customers, or class of customers and see only the tasks relating to them. You do this by selecting project(s) or folder(s) in the sidebar and clicking the Focus button. You can put individual customers on hold or postpone their work until a future date. You get to use the Review functionality to look after the customer projects on an individual basis to make sure they are progressing satisfactorily; you could review your meal-ticket customers' projects every day, and the others every few days, etc. In general, you have the most flexibility and control with individual projects.

As for spotting the "high value" items, there are a couple of approaches you could take here. One is to subvert the Duration field if you don't need it, and just use it as a numeric value, with smaller numbers being higher value. Then you could set the View Bar to show you the tasks with a duration estimate of 5 minutes or less to show you only the tasks you had marked with the highest values (= shortest time), 15 minutes or less to show you the top two tiers, etc. The filter is set up to allow you to find the most tasks you could do in a given amount of time, not show you those which you couldn't do, so it wouldn't work so conveniently to use the actual time you would spend as an indication of value.

Another approach you could use is to just flag the high value items, though you wouldn't be able to differentiate between the various high value items. Or you could "tag" them in the notes with a fixed set of tokens like "@500", "@300", "@100" so that you could set up perspectives showing you all of the items in the "@500" bucket, etc.

Finally, a completely different approach is to take advantage of how OmniFocus uses the ordering in the sidebar to display actions. Move the important customers' projects up in the order, and their actions appear earlier in the lists. If you are in context mode, grouping by project will show you the most important customer's actions first in the list of projects so you can remind yourself what is important. Switching to grouping by context, sorted by project you can look at the contexts you could work immediately, with the actions sorted by relative importance of the customer. You can combine this with other approaches as well, because you are just taking advantage of the fact that OmniFocus attempts to put things in sidebar order unless you tell it to do otherwise.

Make another folder and put your personal projects inside it and you can work them independent of your business tasks if you like.