I'm not really up on what the standard of living was like in the 30's, but is it really possible working 10 hours per week? That would barely pay rent in most places.
I think this is a slippery slope. They are essentially unsolicited mail that you never asked for. Some people will genuinely use the promotions tab to receive email from companies for which they have requested promotions be sent to them. Google is getting a free ride without permission.