I use it because it works and has for some time now.
I've tried many of the commercial Alox base lubes and was not happy with them. In the late 1970's I bought a gallon of Alox 2138F and starting making my own. It's a good lube but has some limitations, it does not work well when the temp is over 75 (not very often here) and it must never be melted over a direct flame, always use a double boiler.
I have three lubes that I use and the Alox-Beeswax is the one that seems to work the best for what I do which is plain-base lead at one and two-hundred yards.