It won't lose value completely, even if it's just 1 usd. Moreover, it will most likely bounce between 4k - 10k forever, with rare spikes of below 4k and more than 10k. The thing is, because you buy a tiny bit every week, you'll have 52 different prices points and the more weeks bitcoin is dropping, the better for you, because the loss from previous weeks will be covered by gain from the current. Pick any numbers, 4245, 5869, 11385, 5496, 9856 etc., list them, then apply 25 dollars to each price point and calculate how much you'd gain-lose. Most likely you are going to end up with a slight profit. The only case where you'd lose money - if the price will continuously drop down, but it never happens with anything that has any value, the price will always fluctuate, even if it's dropping. And these price ranges is where the money come from, not the price itself. You can start at 10k per BTC and end at 2k per BTC, but you will still earn money, cause you play with changes, no the actual value, unlike when you buy BTC and gain from actual value growth, which is a gamble, cause there is not guarantee you'll get money, the price might go down.