I highly doubt GTA 6 is going to cost €100 / £100
£100 for the basic version would be too aggressive, even for Rockstar. They'd risk massive backlash, bad press, and possibly hurting long-term sales
Plus I doubt there is going to be an early acces version. Their games drop like cultural events: one global release date, everyone dives in together, and the world collectively loses its mind.
They let the product speak for itself and GTA 6 is probably the most hyped game ever. They don't need early access gimmicks to drive sales
If they gated GTA 6 behind early access or slapped a £100 price tag on the standard edition, it would go from a global event to a fragmented, frustrating mess.