Well, if you play it the way Abnett describes Bequin's untouchability, the character would be surrounded by a relatively small (5-10 foot radius) antimagic field, as described here:
http://www.d20srd.org/srd/spells/antimagicField.htm
At a minimum, this means the character can't cast spells, use magical items, or recieve any beneficial spells: no teleporting with the party, no bull's strength, fly, protection from energy, and, most urgently, no magic healing.
In addition, other characters would be unable to cast spells, use magical items, or be affected by beneficial spells near the character. Arcane or divine spellcasters in the party would be critically affected, as would anybody who needs a magic weapon to, say pierce someone's damage resistance.
If you're playing a d20 modern game, where magic is special, as opposed to necessary, it's workable.
In a D&D game, the character's limitations not only hinder the character, they hinder the rest of the party.
Hopefully this clarifies the situation for those unclear.