the buying and selling has to do with the separation at judgment
Jesus tells the rich man to sell all he has (all the riches "ego" he has) and take up his cross (his tree of knowledge of good and evil) and FOLLOW Jesus Christ to the place of the skull(Adam's dead bone) where the transformation happens between the death (ego makes us dead) and life (the soul finds life here in the resurrection)
and to Laodecia he explains BUY OF HIM gold tried by fire, eyesalve to see, and white garment to cover her nakedness:
this is the final candlestick/church and the star (Israel are the stars/angels in the first resurrection) who have to bring this light to the churches.......and here the Laodecians (people in judgment) are the nations......
they think they already have everything.........but it comes through Israel (the heart) being MADE NEW and the heart is made new by Jesus Christ in the midst of it helping the angles to fix the heart........and mind (Laodecia represents the part of the heart that connects to the mind of the nations that need to LINE UP with the heart (the first six candlesticks):
the MIND needs to see what the corrected heart "knows" and gold (LOVE) is tried by fire and the white robe (righteousness) must be PUT ON, hence PUT ON the Lord Jesus Christ as the COVER.......over the nature, hence love covers a multitude of sins:
so buying and selling is the soul who has to sell its EGO (its life) to receive the LIFE of Jesus Christ......buy of him):