I'm not invested heavily into bitcoin, as it's just a curiosity for me, but I do want to maintain a small investment in it. To that end, I am just about to get my first whole btc, and although I am thinking of buying something with it, that would just instantly spend the btc that I have, so I wouldn't have any investment in it any longer. Is it prudent to- for example: decide on a btc purchase within the amount of BTC that I have, and then before buying whatever it is that catches my fancy, buy that many BTC so I still have my original BTC?