The first two answers (laughter and wayne) answer your premise perfectly. To make the subject a bit more complicated, money is not extremely controlled...anyone can pay anybody as much as they want, so theoretically speaking, providing referral links could pay big money if someone wanted to pay big money. Money is merely a physical embodiment of what one party brings to the table (instead of barter, economies have placed value on physical money and the owner of the item/good/service being traded uses money to translate value into something tangible).
Having said that, one has to ask what is the actual value of the referral links - if a referral link is worth $100 to a provider, that provider will pay someone "big money" to distribute referral links. Unluckily, referral links aren't worth much - it might take 1,000 referral links to get someone to click on the link and then 100 people who click might buy something - so to get one sale, you would have to send out100,000 links. And then you have to identify how much the average sale is - of the average sale is $100, after all costs, you might have a 5% sales margin so the seller makes $5 before taxes, $3 after taxes, $2 after accounting for retained earnings, and $1 after reinvesting into the business - so $1 is the most that the seller can pay someone to send out 100,000 referral links. Now the question becomes - how much is the lowest amount people will accept to send out 100,000 referral links? Obviously the seller is going to try to lowball this,so he might offer 5 cents for every 100,000 referral links - if no one bites, he might go to 10 cents...and so on until someone bites. At some point before he hits that $1, someone with few skills who can't get a better paying job will accept the offer (remember, there are people around the world for whom $1 would be a good wage) and sets the market.
Only if the job took a certain skill (say the sender had to use an Excel spreadsheet to identify a target audience - maybe a referral link for umbrellas that targeted people in zip codes with a 50% chance or better it will rain today) will you see a higher wage since: a) the response rate would probably be higher bringing in more profit and b) doing the analysis requires a skill fewer people have thus decreasing supply which drives up price.