If you keep selling it will be lower, if you camp on it, and sell sometimes = more money for all
I'm glad some people choose the strategy to hoard their coins selling few to none. It means I get a bigger piece of the pie when selling into a downtrend. They can keep the bag, I'll take the $. If I were to simply take the $ I've extracted from MtGox and buy coins with it I'd wind up with at least twice as many as I've sold.
I sold bitcoins on MtGox in the $20s and high teens. At the time this was considered 'crazy' by some on this forum as bitcoins were only going to go up due to increasing difficulty.
If you need to sell it's worth averaging your sales out over a long period of time by periodical sales. Not doing so is by default betting that you can beat the market and sell at a higher price in the future. Maybe so, maybe not. Most people fail at this. The few who succeed post on these forums about their investment achievements, the rest remain silent.
One thing I do agree with most forum posters about is that bitcoins have found a true resistance level around $8 to $11. It's unlikely they will fall much lower as many miners' costs would be higher than the bitcoins they produce. I know I'll get a deluge of responses from people paying 8c/kWh, but those people need to look beyond the shores of North America. Not everyone pays such low prices. If mining were profitable at $5 or lower with current difficulty (as some claim) then we'd still be seeing a large increase in hash rate every week as it's a no brainer to add as much mining capacity as possible with BTCs at $11.