Long-term DCA seems to pay off according to this DCA calculator.

I've found this really cool DCA calculator online, not sure if I can add links here so just Google: bitcoindollarcostaverage calculator and it will be the first result at the top of the Google search, if you want to try it yourself.

This is obviously purely for fun at this point because we don't know when each user entered the crypto market.

But even if you bought your first BTC at a peak on 12/16/2017 when it was around $19k and bought $100 worth of BTC each month until now you'd be 158.16% in profit right now.

USD spent: $6,800.00 Today's BTC value of your portfolio: $17,543.62 

Looks like the long-term DCA pays off even if you bought your first BTC at the absolute peak back in December 2017, and kept buying through the bear market and even through the bull market when BTC was over $65k. Not too bad if you ask me.

Obviously, past performance does not guarantee future returns.

Bitcoins Dollar Cost Average Calculator