likableness

He has a quick-action brain; but his strong point is his personal magnetism and likableness.

But they are inside him, and you can pull them toward you if you bring your likableness to bear upon his heart.

You cannot over-develop the quality of likableness, but you can over-sell it, to the detriment of your own best interest.

If you like people only within a limited range, you will similarly narrow your own likableness.