Also IGA Pass would offer yearly memberships with 3 tiers ( Plus, Extra and Premium ).
The first tier, Plus, would offer fast track, priority check-in ( airline list not definitive ) and IGA Lounge entry for only the member. The price for this membership is €299.
The second tier, Extra, would offer all benefits of Plus members plus free buggy service from concourse entrances to gates and 30 days of free valet or carpark service. The price for this membership is €399.
The third tier, Premium, which is worth €799 would offer all benefits of Extra for the member and one companion alongside with 90 days of free valet or carpark and 10 free transfers from the city to the airport.
In my opinion, the prices are really expensive and none of the packages are reasonable for passengers having status with airlines. Maybe they could be reasonable for *S/OWR/STE tier on alliances status passengers or passengers who fly a different alliance carrier every different time. The Extra package could be reasonable for travelers insisting going to the airport by their private cars, however, it would be really stupid to drive your own car there unless several situations as there would be buses and shuttles from almost all districts from Istanbul. I won't comment on the Premium membership which could only fits for someone flying 50+ more times a year from Istanbul Airport.
Edit: All prices excludes taxes worth %18.