The effect is, the price is fixed in ETH and when ETH fall down like the last weeks, the value of each FSBT is falling too. But now it is 50% cheaper than 2 weeks ago.
This approach is true if you start off with USD's. You will get more ETH for the same USD amount and thus get more FSBT. But who here still has FIAT money :-/
The smart way to invest in crypto's is to reinvest earning/profits from your initial crypto investments and also if you have spare fiat that you can afford to invest you should do it right now and take advantage of this massive DIP.
I think most people already took advantage of the dip, I advice everyone not to invest more than you can afford to lose entirely