Very generic question. it depends the niche, thje product you offer, what the market needs really.
From personal experience I have done all Link Research Tool webinars. The reward is that you become an associate, you learn tools you need to use for various link cases (from penalties to negative seo, to increase your rankings) and you become better at your job. I didnt even receive an email, i searched and registered on my own.
Their marketing was to release penalty case studies and promote them on Facebook and all the rewards mentioned above. It worked for me and they;ve made money from the agency i work for.
Try and adopt I suppose.
and treat your money site like a business. Industry is changing, google ban web sites with lots of amazon affilaite links etc. Content is king, period.