alt Hacker News> Lobbying expenditures are given to lobbyists not politicians. You're primarily paying for the salary of some humanities or social science majors and their travel expenses, which isn't that much money.
I don't think these are the only expenses, why should politician listen to them if lobbyists are not promising them support in next elections in the form of marketing, payments for expenses and so on
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It's not as if being elected is the end all and be all to being a politician. Politicians have a vague idea of how they want to shape society, but they can't be experts in completely unrelated subjects of healthcare, military, AI infrastructure etc. A good lobbyist will help a politician achieve these goals in the field of their expertise (or at least try to convince the politician that they're helping).
Even ignoring financial issues, people are generally willing to talk to major groups or industries. You tend not to get re-elected if you ignore everyone.
They are interested in learning about topics from credible people that impact businesses and voters,
If the only motivation you can ascribe is making money or relection, it is circular. Wealthy people spend money to become politicians.
> why should politician listen to them if lobbyists are not promising them support in next elections in the form of marketing, payments for expenses and so on
Mostly because those things are directly illegal. Lobbying organizations (and PACs and SuperPACs etc.) are very limited in what they can provide either as direct monetary contributions or in-kind gifts to a candidate. The restrictions here are basically the same as those on an individual, but usually with more strict reporting requirements and lower limits.
The marketing aspect is the only thing that they can legally provide, and that's less a lobbying function than a PAC function, and they are not allowed to coordinate with the campaign or the candidate on this.