Seems like a smart move to stay in business. Too much liability involved even if you don't have anything in writing, all I guy has to do is show a receipt that he paid for an inspection and state the bike shop stated it was okay to ride in court. That guy will own your business after the suit. More I read this thread about steel rusting through and carbon bikes failing, the more I gravitate towards Titanium as the best material for cycling. Brush Ti also looks better than carbon, painted steel/aluminum, etc. as well.