Bengaluru property: What's the real 'all-in' cost, beyond the brochure?

Kanakapura Road fringe keeps coming up every time I shortlist something. I'm looking at a 2BHK from Keya Homes, around ₹90L, purely as an investment. My broker is pushing for pre-launch, saying it's a steal. But ya know, I'm worried about the 'all-in' cost. Base price toh theek hai, but stamp duty, registration, PLC, parking, interiors... kitna aur lag jaata hai? Also, sunn raha hoon ki builders possession ke time bohot hidden charges add karte hain. Utility connection, club membership, maintenance deposit... Is it true? Is pre-launch really a discount ya just a trap? Kya lagta hai aapko, what's your experience with total costs and hidden fees, especially in Bengaluru for investors?