How much tip bellman?
Standard tip, per bag, is $1. If your bellman goes above and beyond (or you want to ensure special attention throughout your stay) consider tipping $5.
AED 5 or 10 Dhs is good enough in Dubai. In India, you can tip 50 or 100 rupees.
Tipping is on personal interest, there is no rule for tipping. It’s a courtesy and concern for the person who provides you the service and how much you value his effort.
Also, it depends on one’s capacity. Maybe a millionaire tip $10 for all staff on a special occasion, which common people won’t be able to?
I remember a millionaire guest tipped AED 50 to all hotel staff, whom he met on a 'special day for him’, while he was checking out from the hotel.