At the start of the books Baelish was powerful because he was useful. Now he is powerful because he has power. The difference is power that could easily be taken away and power that is very difficult to take away.

Lollys is a younger daughter which makes Bronn lord of nothing yet (is he even married to her yet?). Also like Psy said, there are hundreds of these smaller lordships that are often rewarded to those who please their masters. What happened to Bronn is probably not uncommon.

Although Baelish started at a higher place, his rise is far beyond anything Bronn has done and he has gone from a useful cog in the King's Landing machine to lord of two kingdoms and one of the most powerful men in Westeros.