Your video takes way, way more bandwidth than audio ever could.

You should not believe everything people complain about.

Also, you don't need expensive microphone. You need decent one set up correctly.

Most microphones are actually pretty decent in that they can record your voice pretty well provided they are set up properly and that is where usually problems are. You need to have correct geometry so that they can do their job of picking your voice and rejecting noise and you need to ensure correct software audio settings because mismanaging these can cause voice to be distorted or sprinkled with clicks and cracks.