“Somewhere in the cosmos, he said, along with all the planets inhabited by humanoids, reptiloids, fishoids, walking treeoids and superintelligent shades of the color blue, there was also a planet entirely given over to ballpoint life forms. And it was to this planet that unattended ballpoints would make their way, slipping away quietly through wormholes in space to a world where they knew they could enjoy a uniquely ballpointoid lifestyle, responding to highly ballpoint-oriented stimuli, and generally leading the ballpoint equivalent of the good life."
Eventually your pens will all escape to the ballpoint home world, so buying refills for them is silly. And buying new ones is just as silly. When your pens jump the wire and head for the hills, just steal a pen from somebody else. They'll steal one to replace it and so on and so on and so on. Eventually some office manager will buy new pens with the company money and the worldwide pen supply will be continually replenished without the need for individuals to buy anything. So no, there is no reason to buy refills.