> Sure. If you send me X BTC at the following address, I will prioritize this for you

That sounds like a good recipe for getting into trouble because of tax fraud if it gets public. And even you are in the position to accept the money (e.g. by being self employed) it would not be worth the effort. If you charge a low sum the overhead will make it not pracitable and if it's a large sum no individual will want to pay you and companies will often not be able to pay you.