When wealthy Republicans give to their party it is because they expect to receive generous provisions in the tax code which will be far greater than their contribution.
Wealthy Democrats give to their party knowing full well that they may have to pay higher taxes, but they believe it is the path to fiscal sanity.
Ronald Reagan is idolized for cutting taxes and growing the economy. Reagan also raised taxes on the wealthy, and through deficit spending, raised the national debt from $500 billion to $3.5 trillion. Bill Clinton raised taxes, spurring 23 million new jobs and annual budget surpluses.