If it’s a cheap countermeasure that aims, in the better estimate, for a 50% reduction of a small risk I think you’d be better off asking yourself if you’d buy it at double price rather than deciding which of the equally persuasive, conflicting experimental evidences about its efficacy you should trust. Also if you’re worried about non monetary costs like hand skin damage, I guess you’d better decide if you’d put up with the same cost for a 25% risk reduction.
If it’s a cheap countermeasure that aims, in the better estimate, for a 50% reduction of a small risk I think you’d be better off asking yourself if you’d buy it at double price rather than deciding which of the equally persuasive, conflicting experimental evidences about its efficacy you should trust. Also if you’re worried about non monetary costs like hand skin damage, I guess you’d better decide if you’d put up with the same cost for a 25% risk reduction.