What makes you think elections are not bought (or at least purchased out the back door)?

How do you figure elections are not basically bought? Logically by default 8 out of 10 elections are. You have a billionaire or multimillionaire running for an office and sinking boatloads of their own money in the campaign how are they not de facto buying the election? If people are more than likely going to vote on whom they hear about most or see most on TV those with the bigger bucks win. How many times have you noted some one running that was so likes or charismatic they won spending like 30 cents to every dollar of their opponent? And would you really trust some megabuck candidate that is wiling to spend 100s of thousands to millions to get elected to a job that will pay them annually what they spent to refit their mansion in new furniture? Sure can’t be because they want to serve the public.