The "passive seekers" you refer to are what I like to call window shoppers.

Recruiting platforms like this one almost always appeal to window shoppers. Many window shoppers are folks who simply want find out if the grass is greener on the other side. In most cases they're window shopping because they don't really know what they want and they're not motivated enough to figure it out. For example, many of these folks are not looking to work in a particular vertical, or to solve a particular type of technical challenge. Instead, they're looking to see if they can earn $xx,xxx more per year or get into a hotter startup.

I wouldn't say that there are no good window shoppers, but they're rarely as attractive as the folks who are happily employed but open-minded enough to explore a great opportunity if they encounter one. Non-window shoppers are more likely to be people you meet in person. You pique their interest by telling a compelling story about your business or the technical challenges you're trying to solve, not by leading with compensation and your fridge's awesome collection of imported beers.

It's amusing that so many companies don't see these networks of window shoppers for what they are.