What is your linkbuilding outreach % rate if you bribe upfront?

When you email webmasters for links, and you offer something financial up front right away, like $50-100 up front, what is your chance of getting them to accept your link?

Like if you sent 1000 emails, would you get 1%? 5%? 10%?

What is your preferred way to negotate placement?

We get maybe 1 placement per 30 contacts we message, it might cost our link building app $5 in hunter.io credits to get there so wanted to ask.