Capturing resources from asteroids could be more expensive than from the planet, given the infrastructure on the planet. So you may make an investment - spend

Capturing resources from asteroids could be more expensive than from the planet, given the infrastructure on the planet. So you may make an investment - spend initially to make a planet base, then enjoy smaller expenses. Maybe the question is of comparison - how big space infrastructure one need to colonize the planet comparing to returns from planet base. Is it obvious that planet returns are smaller?