We don't have any product to sell :/. We've been creating case studies for 15 months for people in 120 countries. All for free. The community has been asking us to build more even though we're strapped for time. The only way we could make that happen is if we start a premium subscription for those interested (but keep a foundation of free content of course).
Premium subscriptions are your product. If that's not something you're comfortable being honest about, I question the depth of your domain expertise in the areas for which your seeking "donations" to support.
*edit: typo and clarification