In democratic society, on principle, how much your say is worth is not determined by how much money you are able to invest in it. Your analogy would only make sense if you can "buy" votes, and arguably the political sphere is in a pretty sad state too with how much control voters actually have. At best, you're saying that a company can be just as undemocratic as the modern state. That's not a high bar to cross.
Not being able to force your personal will onto others doesn't mean a society or organization is not democratic.