These are what I found in iracing after one month when i joined:
Great ”real” graphics
Super laser scanned tracks. I can feel every bump.
I can race in minutes 24/7
Clean and challenging races (except some rookie races)
Only cockpit view (drive, no play)
All of these making the hobby serious. I prefer pay for these quality services than i play for free the others games with dead community, with aliens setups, without rules, with dated graphics engines, with stupid AI, with bad quality mods, with unrealistic driving views etc. Everyone who wants quality for his hobby iracing is must buy.