Why must one purchase materialistic goods on a Christian celebratory day which was conceived from a Pagan celebration and/or also on the day that you were born? It's illogical to me that social-convention demands that you must do this. I respect people's choice to do so for various reasons, however who are you to judge people that don't?
I don't purchase anybody anything for any holidays, whether they be social, religious or birthdays. I don't need to purchase material-goods to show my love for my family, and I certainly don't feel the need to show 'appreciation' for my mother on one particular day, I respect and care for her everyday, and simply don't go to any trouble to do so on 'Mothers Day'.