If it were a truly demotic activity you would have a point. But as it is, lobbying (in the US at least) is almost exclusively by/for large/moneyed interests, and the part of it which isn't is considerably less effective than that which is.
That you don't bother engaging and others do doesn't give them an unfair advantage.
That being said, the US system sounds like a shitshow of bribery and corruption.