I agree with ThatOnePerson. Set the minimum post cost higher than the starting wallet to prevent throwaway/spam accounts from posting low quality content and to allow a learning period for newcomers. I also think that posters should be able to drop any amount higher than the base into their post.
As a newbie, I think paying should be a requirement. The cost should be above the new account balance so that new people like myself can invest/learn before posting content. Raising it above 1000 would also prevent throwaway accounts from posting.