As a team collector, I try to get all of the cards for each of the major brands. I rely on online checklists to do this. I have no problems with the base cards, but sometimes run into trouble with the inserts and variations.
Having this blog helps me with those troubles. When I show the cards, I have a bunch of extra eyes looking over what I've got. And if I've made a mistake, the extra eyes will help me out.
This happened last week with the 2019 Topps photo variations. I showed two cards. However, it turns, out that there are three. Thank you to Matt for point that out! I was missing #525, Ryne Sandberg.
His card is in the same slot as Ian Kinsler. I still have a problem seeing Cubs card variations partnered with non Cubs.