I'm in the position where 1 cent per click counts for a lot as the volume is extremely high. Such keywords on Google go as low as $0.02 per click which seems to be right when calculating profit. Bing charges $0.05 to $0.07 for same keywords.
Some may say competition or whatever, but no, this is about Bing's Ads setting for minimum bid which is 5 cents per click.

It turns that, for each $1,000 spent on Google, I spend $2,000-$3,000 on Bing for the same amount of traffic.

This is not right and I'll be forced to scale back at the end.