> Well, many lobbyists advocate your views by giving money, goods or services to public representatives...

Sure, that's a tactic that happens in lobbying, just as its a tactic that happens in people directly advocating their own views.

I am not saying that lobbying is free of corruption. But the reason the two often go together isn't that lobbying is fundamentally corruption, its that lobbying is an expensive form of petition, which makes its community of users overlap considerably with the set of people/groups with the resources to effectively engage in corruption independently of whether or not they were using an intermediary to do advocacy to public representatives.