Unvaluable

Because if they never think about you, that means you have never made yourself valuable or unvaluable. You have become a jack of too many trades. So you master nothing.

I kon him thanks that he hath had the hap to chuse, and knowledge to cull-out so worthy a worke, and a booke so fit to the purpose, therewith to make so unvaluable a present unto his Countrie.