I buy them when I have some extra USD so mostly at the start of the month, I also buy as much as I can when I see big dips with nothing supporting the downward spiral of the currency, I exchange some for alt-coins as well when a good coin is getting more popular etc...
you are typical fast trader, i like it, im trader too, sometimes i buying bitcoin for buying altcoin, then get the profit from altcoinn.
now im buying bitcoin just for buying ethereum classic, hope next month will rise to 0.006 again
Yeah same here but right now i am relaying in coinmarket cap i just choosen top 20 in coinmarketcap given me idea what altcoin to choose because it gives me a good profit every month.. or some altcoin is fast movement of the price so i just setting margin binary so that i can make a profit every time the price is increase and decrease..