There isn’t a fee for services model for government. Period.
I’m glad I could clear that up for you.
Accordingly, voting for spending, and voting for tax cuts, aren’t subject to “basic economics.” Instead, they are subject to the various sociological forces of the political system. If you want to contend that things would be different if the government were fee for service, and hence would fit into a free market model, fine, but it’s not a particularly relevant point. There won’t be a fee for service model for government in our lifetimes, the idea is impractical in the extreme, and it isn’t even a good analogy for the operation of government. Suggesting that the incentives behind taxation can be explained by “basic economics” is a waste of bandwith.
Government programs aren’t devised by the poor, nor are they devised by the middle class. They are devised by the governing class, which is largely upper income, working in various areas of academia, think tanks, and then promoted by interest groups, unions, and corporations, and sold to the mass of voters like any other commercial commodity - not driven by some sort of quasi-consumer demand.