Steven,
you won’t run out of topics –
the tighter you niche down, the easier to target and frankly, write targeted emails, build relationships and ultimately make money.
I think that an angle of “this is what works in real life, I had trouble in my marriage, this is what we did” can be very powerful – a lot of folks don’t want to go to a traditional counselor anyhow.
I think the personalized angle can be huge . . and you can always recommend some of the professionals in an affiliate type of way as well, so your members get the best of both worlds
Sean