selling is always part of our daily lives in this.you're not allowed to take it or hold it forever. but if you want to bequeath to your grandson or granddaughter then you must keep it. but you don't have get any profit and don't expect in the earnings because you only hold it. it is a good time to sell if the price of all was drop,but think carefully if it just an short time or in a long time dropping rate. but if you want an higher earnings then wait to the rising up of the price and then sell it