I think people should be prepared to recognise that they are in a fortunate position, whether by their own actions or the actions of those who brought them up, and currently that means a higher tax rate. If you have no actual suggestions for providing the equality of opportunity that you are such a fan of then it makes your aversion to equality of outcome look a little bit opportunistic. You could just say "it's my money, I want to keep more of it please" and then people would at least know where you stood, and it would take a lot less time than comparing everything to perfection, deciding it isn't perfect and declaring it bad.
Are we talking formal equality of opportunity, or substantive equality of opportunity?
One involves ensuring there are no arbitrary barriers to something, the other involves treating people unequally to make up for perceived inequalities...