You can buy eartips for a few bucks
M50 and IM02 are in two different worlds, not even apples and oranges lol!!! M50 is over ear dynamic drivers with warm bassy sound, decent clarity, and not much of a transparency (detailed separation of different instruments). Those are my favorite listening headphones on laptop when I watch YT channels or just background listening; very good build and easy to take on/off or use in Dj-style with one earcup. But they are NOT audiophile quality headphones. IM02 are very analytical and detailed. If you were looking for Etymotic as your original choice, M50 is not for you. Btw, Audio Technica also released ATH-IM50 and IM70 dual dynamic driver in-ears but only available in Japan. That IM50 is more on par with M50 in terms of very strong bass, but you are not going to get the same level of details and instrument separation as you get with balanced armature drivers of IM02.