Bengaluru pre-launch offers: Confused about the 'early bird' discount.

Visited a couple of Keya Homes projects near Sarjapur Road last weekend, aur unhone pre-launch pricing ka pura calculation dikhaya. They're saying pre-launch mein best deals milte hain, but mujhe lag raha hai ki open-market mein bhi builders spot discounts de dete hain, especially if they need to clear inventory. Kya sach mein pre-launch mein buying worth it hai? Ya phir wait karke later negotiate karna better rehta hai? Builders ka yeh 'early-bird' discount kitna real hota hai, ya bas FOMO create karte hain? Any experiences with Keya Homes ya similar builders in Bengaluru like Prestige ya Sobha?