When it comes to loyalty nothing speaks louder than Tesco Clubcard; the doyenne of the points based scheme. Whilst Tesco might wear the crown, the grocery sector in general has always been the one to watch in terms of innovation and engagement. But eyes are currently drifting away from the supermarket loyalty wars and focusing instead on the hotel industry. Specifically they are zeroing in on the $12.2 billion acquisition of Starwood by Marriott and what this means for two of the largest loyalty schemes in this space. There....