You can make it a simple 1 sat to vote poll, it doesn't have to be pay to win. There are limits built into the nip and the implementation. A small payment is a perfect way to disincentivize spammers too. Free polls will be useless due to them
And you're plainly wrong. Being available in only one client is a huge issue that makes features non viable, use your head. If it's only working for a small number of users, it won't gain traction. We see this constantly on Nostr.
Just because you don't know how something works doesn't make it a bad idea 🤷♂️