Lately, with all the high prices S-Ranks, I've been saving for one or two weapons. I was wondering how others make their dosh?

I'm currently failing 7 Star Tenora Works Melee (Stelnium) boards for Catilium and Mot Walna. Making 850k on Catilium and 250k on Mot Walna. Usually 1 to 2 Catilium synth in a set of 10 synths. I made 6 million today with this tactic.

What do you do?