You can actually start you own signature campaign. Those people contacting you are freelance signature campaign manager that will do the job for you in case you don’t have a person to manage it because you need to read first the forum rules to make sure you are not violating any policy here which you can avoid by hiring an experienced manager.

The second issue was trust issue. Participants will not gonna join unless the funds for the payment is not secured. You can hire escrow to do this but you need to pay for the escrow fee which is additional expenses which you can save if you hire manager.

Conclusion: You can run your own campaign as long as you know how to run and manage it properly. Good luck!