Re: Is it a good long term investment to buy 1 BTC today?
It's better to purchase 1 Bitcoin right now at once than to buy it spreaded over several months. Now the price is still $325 you can benefit from it. Who knows what the price will be in January 2016. It could be $450-$500 which means you miss out on profits you could have made when you bought 1 Bitcoin at current price. The closer we are comming to the block halving, the higher the price will be 
Do you know or not know the future Bitcoin price? I'm assuming you don't know. What if Bitcoin goes back to 200$ next month?
If people invest with your method in Dec 13 - Nov 15 period they lost a lot of money. You can't predict the bottom or top, unless you are the maker.
Nobody really knows, everyone is just speculating. If it does goes back to $200 I'll be buying more bitcoins.