Whenever I sold something I would delete the price, decsription and image so there was no confusion as to its availability.
I can see why you want to retain the price so we can see what it sells for, but 2 things come to mind 1) that may not have been the price it went for as often a near (or even far!) offer gets it 2) I personally find it a bit of a pain to read through pages and pages of descriptions of things that have sold to find the odd item that hasn't... when I do it in future I'll probably reorganise the post such that unsold items stay at the top of the post and sold items get moved to the bottom.