Should I run LinkedIn ads?

The Social Media Examiner says proactive LinkedIn Ads (to cold leads) are only a good fit for:

• High LTV ($15k+) B2B
• White collar recruiting
• Higher education recruiting

With remarketing it is a whole different story, since remarketing is essentially the same as adding one more place/platform/channel to display the exact same ad that we are already running with Google remarketing (Google has a very wide reach with lots of places/platforms/channels, but they can't deliver ads on platforms they do not own/not in their ecosystem like LinkedIn or FB or Reddit).