Why would I trust you that you will not run away ?
Well xinzark is right here.You should escrow the funds with an escrow here. Whether the campaign is long or not or you are allowing more members or not isn't related to the fact of escrowing funds or not. Even if you run it for a short period you may still scam participants. If you want to cut the cost of escrow fees then you can use a free escrow. There are many trusted guys providing free escrow.
Its very wierd to see participants enrolling without ensuring that they will be for sure paid for posts. It is always recommended to apply to get enrolled in campaign with reputed escrow.
While looking at your post history I found that you requested a loan of 0.02 btc 6 days.. Isn't that suspicious ?
IMO that does displays the financial position of the OP here but it may also get improve like maybe he received some funds after the loan date. I am just talking about possibility. But still I would recommend OP to get an escrow.