Yes that will a good approach and best if you are looking for long term investment. BOOM may not go up in coming days and your investment may hang up for a while there. But I dont think there is any loss in buying BOOM at current price. Rest DYOR before making any decision.
Invest only if you are looking for long term investment. I don't think deflationary tokens will go up in price in short duration of time. There biggest problem is that they start with huge supply of coins and will take considerable time before there supply will go down. Check exchange and see whats current supply of coin before you make investment.