Why did Kuldeep singh Bindra alias Punnu, a dubai based millionaire marry a poor girl from Armenia ? 

One big reason was that he could easily hide his illegal business with her and he could use her for some of his activities which she would definitely not question 

Being a Hindu yet he married a poor Armenian girl ? A strategic move to hide his illegal operations
An educated & modern woman will confront and often object to income sources from match fixing and other questionable activities

Kuldeep singh Bindra - to prevent his wife from ever questioning him kept her constantly occupied with luxury shopping; salon visits, first class travel and foreign vacations. By surrounding her with wealth and comfort, he ensured she was too distracted to look behind the curtain of his supposed “success”

Kuldeep singh Bindra alias Punnu has purchased and gifted multiple apartments to women involved with him, only to use these properties as hubs for adult entertainment and match fixing. Mujra performances are allegedly hosted there, with international bookies and his cricketer friends from London Pakistan Sri Lanka etc paying for access. There are not social events, but private & dark business dealings disguised as entertainment