The real cost game builders play in Bengaluru

Yaar, I'm so confused and frustrated. Visited Inspira Infinity and TG Legacy last week. The difference between what they advertise and the final cost is just insane! 'Advertised price vs final cost ka game bohot chal raha hai' is an understatement. TG Legacy is upcoming, so possession risk kitna hai, especially with these market conditions? Inspira mein bhi they're very vague about 'other charges'. Also, any tips on understanding carpet area efficiency? Builders manipulate that so much.