Targeted Domain v Untargeted content.
 

I was wondering what to do with my domains that I earn very little from. These domains get quite a bit of traffic from various sources but never really convert like they should.
Is it wise to either create specific page(s) for a completly different niche or redirect the traffic to a sponsor I am converting better with?

IMO, if a visitor has clicked your link, mainly from SE traffic then they are expecting to see the cached site or the meta desc. If they don't see this are they likely to leave ASAP or stick around and sign up for the different content?

Hello....

trial and error... trial and error.

try different things, find out what works/what doesn't work.

Yup, keep testing and track all changes.