Following quote is from this wikipedia page on single unit recording.
Intracellular single unit recordings require electrodes be inserted through the cell membrane to record from within the cell. Glass micropipettes or metal electrodes may be used for intracellular single unit recordings, but glass micropipettes are preferred because their high input resistance allows more precise recordings for measurement of resting potentials.
How high input resistance helps better recordings? Shouldn't recording electrode have as low resistance as possible?