Hey. Yes you can use just one website to promote multiple affiliate programs, but I’d say that your website should focus on just one niche. So you mention, SellHealth, that would lead me to believe your site is about health and fitness. I would then advise you to stick to that niche rather than promoting unrelated products like dog leashes and fashion accessories.
As an affiliate for Boatbookings, you will receive 20% of their revenue - effectively meaning your commission will be about 4% of any sales from your referrals. You also receive 10% of any commissions Boatbookings make on repeat customers who were your referrals. They do have a minimum charter value of 3,000 ($/€/£/etc) before commissions are earned.
On the technology-focused forum Hacker News, a user who goes by "graeme" pointed out, "This is likely to have a massive [e]ffect on the blog/article review ecosystem. Most of the review sites that exist today only do so because of [A]mazon's fairly generous programs. I expect in aggregate there will be a shift in what lines of business people decide to get into, based on this." A user called "sharkweek" said that "[a]s an Amazon affiliate who has done quite well with it, this is definitely a gutting." The mood is equally grim on a subreddit for people building affiliate websites.
There is a reason why many major merchants prefer to utilize affiliate marketing networks instead of setting up their own infrastructure. Just as the administrative burden can become overwhelming for publishers with multiple relationships in place, it can be too time consuming for merchants as well. Maintaining direct affiliate relationships involves building out an infrastructure to track referrals, calculate commissions, and process payments. While that may sound like a relatively straightforward process, it can become a major investment with plenty of potential complications and liability issues.
Affiliate marketing is commonly confused with referral marketing, as both forms of marketing use third parties to drive sales to the retailer. The two forms of marketing are differentiated, however, in how they drive sales, where affiliate marketing relies purely on financial motivations, while referral marketing relies more on trust and personal relationships.