Thought about this a little:
Getting 5 million from each subscriber is a beneficial source of money. They can spend that in anything regarding the targets and/or other goals.
They also get a shortlist of people having at least those 5 millions (or more) AND who think they are strong enough for the job. So they know that in that shortlist they get fighters that did earn quite a sum with their abilities, which is valuable information too.
Obviously, you'd still get lousy people in that shortlist, but not that much since this is quite a sum to begin with.
With that money, they can even start getting intel on the subscribers.
Now that doesn't mean successful fighters, having those 5 millions are strong enough to do the job, but even then they can be useful if hired in the organisation (some of them at least)