Till now I've solely relied on my list.

I've got a very healthy relationship with them and only promote things I really stand behind. That also means that I'll never use the copy/paste emails supplied by people. I'd rather throw in some good info and pre-sell, instead of delivering an email they already had 4 or 5 times...

Next, I've tried this with just one launch till now...

Is that I offered a personal coaching session of 2 x 1.5 hours. The coaching, and thus my experience and knowledge, was added value to the original offer of course.

-Dave