100 DM for the double credits - Is it worth it early game?

I know most people will tell me to save my DM for managers and manager slots. However, I'm at a point in the game where I get like 30-ish credits for a relatively short run, which is very frustrating. Especially because many mothership room up require 48, 64 or whatever credits.

Would it be worth it to occasionally use the double credits option for a longer run? As in... 10-100B galaxy? That way I can actually boost some room upgrades.

Or should I just stick to the grind and save up for managers?