Paying someone to do your homework is very expensive, even if it seems cheap.
It costs you your integrity, your chance to learn, and your preparation for the real world. If you pay someone to do your schoolwork, you'll face the consequences for the rest of your life. Teachers try their best to prepare students for adulthood. While you may not know how to get ready for it, teachers are experienced adults who understand what's needed.
I had a friend who didn't take school seriously. Years later, I saw him working as a cashier while I was visiting my hometown. School was easier for him back then, but life has been easier for me since.
It's tempting to take shortcuts now, but if you want an easier path in the long run, work hard and learn as much as you can.
Also, teachers can usually tell when students aren't doing their own work because they know each student's style and skill level. Paying someone else to do your homework can get you in trouble if the quality doesn't match your usual work. Besides costing you money and experience, it could lead to detention or grounding.