These people make very little money. The practice here is that if they take good care of you, bring you your tea or coffee when you want it.  When they do little "extra" things for you i.e. photo copying, quick service etc.  give them some money. This is QR 5 or 10.- depending on what he did for you. Sort of like a reward.

Don't lend money. Only give them little extras when you are happy with them. And do this on a regular basis.

Aisha-Taweela