Mysql and use of nothing, null, 0

[PracticalBot]

I have a new addon with four integers for xf_user; no I need a fifth one.
The programer has setup default value = 0; this means that all my 1.020.347.433 users have now four or five new fields with a 0 inside.
And this means to have 1.020.347.433 trillions more bytes to save and load all the time?
Could it be better to save just nothing (and care to make to 0, when needed)?
Or save "Null" instead?

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