In the draft alone, they have given out 5 since giving Tanner Houck $2.6mill in 2017.
The draftees the Sox have given out $500K+ bonuses to are Durbin Feltman, Elmer Rodriguez, Ryan Zeferjahn, Dalton Rogers, and Matt Duffy.
None of these bonuses exceeded $700K. In fact, only Dalton Rogers exceeded $600K. If you had just aimed a little higher with your barrier, the numbers would have dropped off rapidly.
If we go back the full ten years, you can add Jay Groome ($3.2mill), Shaun Anderson, Michael Kopech ($1.3mill) and Jared Cosart to the 6 mentioned above...