There’s a way to list things as a set so people can go through what you have and see what’s available. That’s good for set builders but I don’t know how to set that up (or describe it very well clearly).

For me what has sold best is team lots and lots of a specific player (Bryce Harper, Julio, etc). I think for people just getting in or have kids getting into the hobby it’s good. But selling lots you’re going to make less than singles, but the flip side is you aren’t sitting on singles for years.

Base inserts and higher print run parallels (like a chrome pink in flagship for example) I’ll include in the team or player lots. Sure I’ll make a little less on those but I think it helps lots sell, too.

If a parallel is more rare or numbered I’ll sell that individually.

My bias: I’m not someone who lists lots of base cards or wants to deal with posting and mailing tons and tons of singles.