The employer, again usually through its insurance company, pays for all of the medical expenses, as well as most mileage for travel to doctor appointments. (eschmannpringle.com)
Cash is more liquid and I can redeem them at lower values than most mileage redemptions. (travelcodex.com)
As is the case with most mileage bonus promotions, the more miles you purchase, the more you'll earn. (pointsmilesandmore.com)