Why put a limit on the amount of points you can enter ? It seems to me you would want to sell as much of your product as you can and by limiting the amount of points you can add at a time doesn't seem to point to that.
Its a behavior modification thing. Also likely they are dealing with cheaters.also its a way to raise the "prices" also its lesswork for them. Im going to blog about it but the sustainability thing is garbage they clearly hired someone who is in competent.
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i have a project discussion with you please email me on: (santiago.luciana@yahoo.com) for brief information, i urgently await your urgent response to this email, Thanks