Nathan... first of all ask yourself a few questions..
1. Have you heard of checked and vetted before?
2. did they approach you, or the company you currently work for?
3. have any friends and family heard of them?
4. How much does it cost to join?
5. what are the benefits of joining?
6. Are there any other carpet cleaners on board?
1. If you have not heard of them before, then most of your potential custards probably will not have either.
2. If they approached you, they are either new or struggling or just after your money.
3. Like 1. if you or your friends and family have not heard of them..... see above.. iF EVERY one you know has heard of them and they are a big concern in your area.. maybe...
4. You should weigh up the cost factor of joining, to how much publicity, or customers you may get, and decide if it is worthy it.
5. Only you can decide if it is viable for you.
6 If there are other carpet cleaners on board, do you want the direct competition for a paid for marketing medium?
Personally I never entertained any of the sort of schemes this is, but then I am an old cynic who doesn't trust any form of advertising, having been bitten many times in the past.
Welcome to the forum by the way...