It's not a profit guaranteed service. Its a hashing rate guaranteed service. If you rent a car and drive it to 7-11 instead of your job, you will not make money, and still have spent your rental fee. It's not the rental company's fault you made a poor choice.

Lease prices are not high, they are half what they were when I started leasing my rig, and going down weekly it seems. If you think you can do better on your own, lay out the $5000 for a small hash rate setup and try to make that back.

If you want to make money using the service, it's not complicated. I've done it. Look for your opportunities, rent your hash power, sell your coins. If you fail at any of those, you will lose your money, and it's nobody's fault but your own.

Good luck google translating that.