Because the braindead entertainment journos just put out the press releases, whatever is issued by the PR guys. Indiafm has been continously pumping figures as if there is no tomorrow. Most of the other newspapers/websites also doing the same. Copy-paste the press release. But there have been few reports which dimissed the 100 crore claims.
Check out this report in LiveMint. According to it, the figures are as follows
Release – 700 prints in India & 260 prints in the overseas market.
Cost – Rs 75 crore including print and publicity, entirely funded by Eros International.
Collections – First week closed at Rs 20 crore distributor share (India) and will touch Rs 25 crore across its entire run. Collections were affected due to a massive downfall in the film from Monday evening onwards.
Verdict : Kambakkht Ishq team popped the bubbly, the dampener this week was that Eros will suffer a loss of almost Rs 10-12 crore on this film.
Indiafm
Cost : Rs. 62 crore, including print and advertisement cost.
Collections : This report on Indiafm.com is the same as the official press release. According to Trash Adarsh, the film has grossed Rs. 100 crore worldwide in its first week, making it one of the most successful openings in Indian cinema.
Rs. 70 crores in India (Rs. 42 crores nett) and Rs. 21 crores overseas business, with music & digital platforms grossing Rs. 10 crores. ( Why would anyone count music & digital platform rights with the box office collections ? A clear indication of being desperate to add up the numbers and make it 100!)
The Times Of India
And now the figures according to today’s TOI (page 10. Could not find the online link. You can check the e-paper here and go to page 10, the header is For cine buffs, content is king )
Sold – At a price of Rs 80 crore
Collections – In the first week distribution share is Rs 30 crore, it is certainly difficult to recover the entire cost. Even if satellite rights are sold for Rs 10 crore and home video for Rs 2-3 crore, recovering costs is going to be a tall order – Trade analyst Amod Mehra.
BoxOfficeIndia.com
Collections : Kambakkht Ishq had an excellent first week of around Rs 36 crore nett. The film has done brilliant business in the North while collections in South India circuits like Mysore are on the lower side. The collections on the 8th day have shown a big fall of around 65-70%.
So, what to believe and what to chuck ? As someone wrote on a blogpost, Box office news and updates of Kambakkht Ishq is more eventful than the movie itself. Couldn’t agree more!
Shortkut – The con is On. Shortkut with a “K”, whatever that means. Produced by Anil Kapoor, directed by Neeraj Vora, written by Anees Bazmee and stars Akshaye Khanna, Arshad Warsi and Amrita Rao. And if the early reviews are any indication, its time to switch off the con even before it gets on!
For all you fans of Mohanlal, here is some good news. He was commissioned into the army today as honorary Lt Colonel. He joins the Territorial Army, the part-time citizen’s work force which works with the regular army. 
Like me, if you belong to the tribe who loved Sanjay Khanduri’s Ek Chalis Ki Last Local, but never went to the theatre and managed to catch it only on tv/dvd after someone reccomeded it strongly, and you still feel guilty about it, then here is a chance to redeem yourself. Get your tickets booked for this week’s release Sankat City, directed by Pankaj Advani. His first release.
Remember Hum Log. Badki, Majhli, Chutki, Basesar Ram, Daadi, Nanhe & Ashok Kumar’s closing act. One of the most popular tv serials to air during DD days is 25 years old. Rediff pushed the rewind button and spoke to some of the actors who became household names with Hum Log. Click 
Thats what the news reports suggests. It was suppose to be a big budget film starring Kamal Haasan & Asin. Walt Disney was producing it and to be directed by Bharatbala.
F.i.g.h.t C.l.u.b 