Data Mining Sweet Spot
K = TB/C (Benefit/Cost ratio of a random contact)
Profit is maximized at Pmax ~ 0.25K 2
Selection is profitable when Pmax < 1
If K > 2, Pmax > 1, and selecting ALL is likely to be most profitable - no mining needed (:()
If K < 0.45, max profit is at P < 0.05 (too small?)