I thought this was stupid question until I actually started to hunt out of a saddle. I had a climber in a tree already and a ladder stand hung in a good spot when my Guido's Web arrived this year. I have hunted them each exactly 1 time since getting my Web.
I probably won't sell my Viper because you never know. A quick hunt pops up during gun season with a short walk to the stand... A new property that I may want to scout before putting up anything permanent...
But I will sell all of my other stands, keeping just a ladder for when my old man comes to hunt with me. But his knees are so bad that it will be ground blind only for him soon.
I have a 2lb John E. sling on the way before next year. And I'm sure I will pick up one of these Aero, Evo, treesaddle, type slings before next year as well.