When I travel I regularly starve - because I cannot find a Halal restaurant. I also need to pray 5 times a day and need information on prayer timings and mosques. There is no Arabic travel guide available. Irhal.com is the answer. 1 million unique visitors came to the website in 2014.

Muslim tourists spent $137 billion in 2013 (Thomson Reuters).

Mobile penetration in the Middle East is over 70% + lack of Arabic mobile content.
Advertisers are willing to pay a premium to reach this audience.