I have seen multiple posts where you promose to take it into consideration but obviosly you have not. You also don't explicity mention this crucial missing feature on the buy page and since you don't agree to any refunding users are trapped.
You wrote that one can read the data off the database - that is just half correct. You can see who participated but you cannot see who voted for what.
What options do I have? Should every buyer that needs this option just pay for custom code or are you willing to provide this feature soon? It is obviosly not a very big problem to acutally make it work. Why are you not doing it?