I used to do this. Just ape in as much as I can when I can. Did it for years. I don't really think any one method is that much better than the other at the end of the day because it seemed to me had I done DCA instead it would have been about the same. I decided to start DCA instead because it gives me a chance to spend my fiat for immediate unexpected needs that might pop up week to week that I don't have if I lump sum it. It just allows me to adapt more dynamically as my needs change in a financially tight situation.