so i tried selling 1 soj just to see in a private game if the message would pop up , but nothing did ? XD is it because the game is private or do i need to sell more than 1 just to see the someone sold stones to the vendor bla bla message XD ?

Its just that not every soj gets an in-game message. Sometimes, as in your case, not even the 1st soj gets a message. Which is fine if you're trying to do a walk plan to dump a bunch, but super annoying if you just want to sell 1 test soj to see the count.

I dont know why its like this, but i know it has nothing to do with your game being private. And it has nothing to do with only selling one. However, if you sell 1 and get no message, leave the game, rejoin, and wait 5 min before selling another

I read that the soj sold message only get sent every time 60 sec has gorn by. So if u sell 10 sojs in the 60 sec then it will only post the last soj sold number. Ex say the soj count on the ip is 80 and u sell 10 sojs in under 60 sec then the message will just say 90 sojs sold. Donno if this explains the phenomenon. Also it does not matter if game is private, all games that share the same ip (even sc, ladder or hc) will recive the same message!

Regarding your example, in my experience, if i sell 10 sojs rapidly, its usualy the FIRST of the 10 that gets a message. (Again, usually, but not always.)

You're right that only 1 of the 10 gets a message. Whether it be first, last, or one in the middle. I've never timed it but 60 second delay sounds right