These things occur by the thousand – Register|Login. However, I don’t think that there is more than a tiny fraction of one percent that tells the visitor ‘Why?’
The absence of any indication that there may be some benefit to the visitor from registering leads to the suspicion that the only reason can be data harvesting.
A couple of years ago, Pick n Pay started their ‘Smart Shopper’ programme and I duly took a fanfold. There was absolutely nothing on it about any advantage. I looked at the application form and it required my cell number and email amongst other items. Pick n Pay ‘REQUIRED’ these details otherwise you couldn’t register.
In the absence of any advantage and because I have enough spam I chose to leave the thing. Eventually, of course, if you spent R500 you earned enough points to get a R2 discount. Whoopee. You’d do better shopping at Shoprite.
Where there is a ‘Full Content’ option or ‘Members’ Area’ I understand the Log in but without any incentive to do so, why bother? I think most Internet users have little or no idea of the importance of email addresses to businesses and that these ‘Register’ boxes are no more than email and personal details harvesting.
I have gone through the registration process a couple of times with no visible benefit from having done so. It seems contemptuous of websites to expect visitors to register without telling them why.