Ptolemaics were greeks and they had greek customs. But they gave religious and cultural freedom to natives and also took some of their practises (titles...) to be more popular. Popularity and stability were important - Egypt was the most stable diadochi kingdom as Alexander was their "saviour" not a conqueror like in persia. I am talking about the first 3 kings who made egypt the strongest and the richest kingdom in the mediterranean. Late kings were weak and destroyed what heir ancestors did. Hanibal during his conquest considered egypt to be weak to help him and did not ask for aliance.
Later kings were one like another and their reign was full of rebelions, fights for throne and stupid politics.
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