Lobbying is a critical part of a working democracy, the issue is that lobbying has got out of control with regards to spending and in many cases outright corruption.

So what is so critical about lobbying?

In an ideal world, it informs politicians about issues seen in society, a healthy politician might not see the issues a person in a wheelchair does, thus the person in a a wheelchair needs to talk with others in the same situation and form a group that can lobby their cause.

Unfortunately, as with anything, wealth does have a huge advantage here, so limits on money spent lobbying is a very good idea, banning it outright is a very bad idea, probably impossible in any country with free speech.