Trimming user table fields

[Tekton]

Does anyone know what'd happen if I started getting rid of fields made by vB in the user table (and maybe others) that I have no use for?

Things like reputation, reputationlevelid, icq, startofweek, threadedmode, etc?

Would this cause mass errors, or is vB able to handle those being missing and just ignore them?

[miz]

its will couse major errors. dont do it, vb wont work properly