You can send an email to Admin recommending that default sort option because you're right it automatically defaults back to chronological order.
And that's the same way I believe it shows up on your Profile page, too.
There is no limit that I know of on lists, but it ends up pushing your Trading section further down the page - if that matters to you.
What I'd done in the past is select a few to post at a time, and as I update some I'd remove one, but not always.
Follow my blog - I Identify as a Card Collector.
“Aslan didn't tell Pole what would happen. He only told her what to do. That fellow will be the death of us once he's up, I shouldn't wonder. But that doesn't let us off following the signs.” - Puddleglum in The Silver Chair by C. S. Lewis