Not in government. See below...
Here's the big difference. In shopping, you 'vote' for which products you want, and you get those products. In government, you vote for which leader you want to represent you and... well, you get whatever the majority decides. (Or the biggest minority in many cases)
What if when you were shopping your only choice of food was between the Conservative Fun Pack or the Liberal Party Mix. And no matter what you chose, you would get whatever the greatest number of people supported.
Sure, sometimes we have it both ways by having an opposition government and so on. But regionally if 5,000 people vote for one group, it doesn't matter in the end because 5,100 people voted for the other group. We're all stuck with the Conservative Fun Pack... A lot of people wanted it, but a lot more people are stuck with the choice made by the largest minority.
So, what am I saying? I'm saying that there exists a system in which people are rewarded for benefitting others - and then there's politics, the bloodsport which people weirdly seem to enjoy at their own expense by letting tax dollars and freedoms fly out the window in the process.