Before her scandal, Park Bom's singles were huge despite having only two of them. Including her features in other artists' songs, her own songs were also hits. Err... to say they were just hits is an understatement, they were mega hits that snatched her a Best Digital Single award in MAMA and topped Gaon charts for weeks. She also featured a lot in other songs most notably Bigbang's. They loved her voice so much that they literally snuck her voice in their song "We Like 2 Party" although very subtle. Why do you think YG didn't promote her more as a soloist? Say what you want about her voice or technique but she could have been huge like Taeyeon or IU. Here's Bommie's voice in the background in the chorus. It's much more clearer here.