The total cost depends on the amount of work required, which will (among others) depend on the number of participants. I prefer weekly payments.
If you're interested in my services, have a look at my thread: LoyceV Legendary Campaign Manager | PORTFOLIO
I've teamed up with Thekool1s in [BitStopShop]Graphic Design,Video Animation, Management Services to be able to offer a more complete package.
Two things though:
1. We only work on projects that we personally believe in (most ICOs are just money grabbers and won't qualify).
2. I hate spam, so the campaign rules should be strict, and not pay for spamming on this forum.