I card sends the persons wishes, as in "wishing you a Happy/Lovely Birthday".
If you are one if the main people helping to make the Birthday "Fantastic etc", then a card isn't needed, as such.
I send cards to people that I know put them up.
I am already having the argument that if people give me Christmas cards they will go straight in the recycle bin, wherever I am. They might as well put a £ in the bin.
I object to the environmental impact if all this unnecessary crap that we have been fooled into buying and filling our homes with, which then causes stress, so we go and spend more money.
I give time and turn up happy to join in and have a good time, rather than handing something that is mass produced, meaningless (go to any card shop, very little thought is put into card buying) and wastes natural resources.