2 reasons cn be attributed to it
1st.... February.... This month has nvr given a big grosser to the Industry...nd History says it
2nd The Film was not that Entertaining.... atleast not upto the requirements of the Core Hindi Base Audience
plus SRK's statement during Jan.... also to sum extent impacted a little, as many people (neutrals) felt, he shud not hav said dat.... nd not to forget SHIV SENA's Vandalism costed MNIK a gud chunk in MUMBAI Circuit atleast for the 1st weekend.
having said dat....the most important reason was...."Lack of Entertainment"