So I've come across as number of affiliate programs, and they all seem good, there's Fiverr, there's WPEngine, there's Siteground, there's Shopify.
And IDK, I got a stupid idea a while ago, take Fiverr for example, they pay $30 for every first time buyer you refer to a graphic design service, there are jobs that go for as cheap as $5, when making the payment, you end up spending like $8 because of VAT, so let's say $8 to get $30, and I know a whole lotta people from college who'd gladly accept $2 to create a Fiverr account and make a purchase with my link, so that's $10 to make $30, they'll obviously be far from me, so it's not like the IP addresses will clash or anything, only issue I see here is the fact that Fiverr would probably get suspicious and have me banned for getting first time purchases all the time, but at the same time, I can mix it up, throw in a few returning buyers, it'll only take a bit out of my profit.
But if it's this easy, why isn't everyone else doing this

Another example is WPEngine, they pay $200 per sale, even if it's for the monthly basic plan that'll cost less than $40 (including VAT and card charges), yes, they have a waiting period, but for a 5X, it's not so bad, why isn't everyone else doing this?
Please tell me what I'm missing

And then there's Siteground, they pay every Wednesday after your second sale, it has a tiered payment system and the lowest is $50 per sale, and you can get a monthly plan for like $20, and as your sales go up, your commissions per sale increase, so eventually, you can be throwing in some $60 yearly plans to mix it up and avoid suspicion, by your 11th sale, you're hitting a 100 bucks per sale.
Please, help cure my naivety, tell me what I've missed

People aren't doing it because it's illegal, and if you get caught, you get spanked.