You can simply hire users here OP to make A signature for your project or business. Then run a bounty program here in the forum. The higher the rate you pay the higher number also of bounty hunters will participate. You can give them rewards like coins that are being traded or listed already in an exchange like bitcoin, eth and many more coins.
Just visit how the bounties altcoins section in this forum to learn more from the bounty manager that runs bounty program.
OP is talking about ads in bitcointalk, not about signature campaign. Signature campaign and bitcointalk ads two different way of promoting project.
@weidex
If you have nothing more to know, lock the thread please.