Airport taxi Tbilisi

I arrived to the airport of Tbilisi at 5 am on Monday. My friend was late and decided to walk outside to wait my friend there. After stepping outside from the airport door I was surrounded  by 20 taxi drivers who were offering me a ride to the center. I declined offer from 5 taxi drivers while walking to a good waiting place. I was waiting my friend on my feet for 30 minutes and during that time at least 20 different taxi drivers came to ask me if  I needed a ride. There were few who were more persistent than others and I had to decline them 5 times as they came back to me again and again. It felt like Taxi drivers were fighting to have customers. Black market taxis were offering ride for 20 liras (8 EUR) as official taxi costs 30 liras (12 EUR).