If the pool closes at the end of the sale, nobody will realize you sponsored the first two of Shiv's introduction until after the sale is closed. I can see two options:

1) Mark the other poems you're sponsoring so people can see which ones they are.

2) Start posting the stuff already funded but leave the pool open in case anyone else wants in.

Both cut down the flexibility a little, but if you're sure about what you want, that's less of an issue. Let me know if you want me to do anything.