Thoughts on resellers and those who buy from them?

I’m curious about your thoughts on the topic of resellers in the book world.

For instance, with the book in the screenshot being sold out on day one but restocking in early February, how do you feel about people who choose to purchase from resellers at marked-up prices?

Is it justified if they really want it and have the money? Should people who are upset by this practice just be patient and not hold ill feelings towards those who participate in it?