I hate meds and haven't been to the doc myself for colds and such for over 5 years. I use a lemon/water/honey/oregano mix for colds, but have not used any antibiotics for such in many more years. An ear infection/ache will go away.
However, I will say my oldest daughter had a lot of ear infections and was on meds constantly. One morning we woke up and her ear was foaming and her ear drum had burst. I didn't hold back on meds for her, as she was always on them, but the ear will fill with infection and get trapped, eventually bursting.
I have never heard of the BM ear drop, but have no problem with a dose of BM mix.
Personally, I would not play with a young child's ears. My daughter lost part of her hearing with the burst.