If threat is restricted to a value between 1 and 40 that isn't dynamically changing, then this is the only situation I can think of where adding new threats above Gold10 might help: https://imgur.com/k9hb6pq
You could also just "stretch out" existing threats. But then some people's might go down.
If matchmaking actually uses an even deeper value than this, and if it isn't clamped/restricted, this wouldn't help.