Thanks for the kind words. I think that it's possible to motivate a sales person with that kind of track record via compensation–but not likely. If the reason that they've been underperforming is that they feel undercompensated vs. the market, are putting their time into finding a better paying positions, etc., then possibly yes. If it's for another reason such as they aren't by nature hard working, they are struggling to understand the product technically, aren't good at relationships, etc. then if won't matter what you offer them.

A great and detailed insight on the Sales force compensation.

Can a higher compensation motivate a sale person who is suffering continuous failures?