The "rule" is to protect the reader....not the board
Every Reader stay free to put up his/her own restriction because they need to have the full control in what they feel are right or wrong.
If a reader get "good connection" to one that has only 1 post...then respond to this post in good faith.
The "rule" about at least 10 post protect you so that no one can say.."you gave to that one why not me?", then you can say contribute a bit more so I get the connection
And to be a bit cruel to some of our seekers.....It is a great egoism when your 10 post include 8 - 9 request about readings and 1 hello and we never see any Thank You....you destroy for many that comes behind you !