Fed up of renting, finally buying in Noida

Okay I'll be honest — I completely underestimated how many hidden charges exist! I'm looking at a 2BHK in Sector 75. Builder is promising OC soon. But EDC/IDC charges ka jhol hai. They didn't mention it earlier. Now they're saying it's mandatory. Anyone else faced this with Supertech? Or ATS? I'm confused if this is normal. Also, what about maintenance charges after possession? Kitna lete hai generally? EMI vs rent math is going crazy. Should I back out?