Emirates best ever promotion on miles was 100% bonus (shortly before their devaluation) which worked out at AED0.056475/mile. The advanced Skywards+ package (20% extra miles, 20% upgrade discounts, 20% one off award discount) costs AED2700 so to extract value, it would need to "save" me at least 47,808 miles over a year.

So I see it as a simple question of maths. While I'm fairly confident I would come out ahead, as I don't have the need for the extra miles, it's also a pass from me. Time probably better off spent checking the prices of EK wines on google.