I guess I'll be the first one to say no. It only takes one scumbag to ruin your day. They don't even have to take your bike. They can just go for the components too.

I have a $1500+ bike and the only reason I bring it to work is because I have a bike locker. If I need to stop by anywhere else where I need to lock up the bike to a rack I bring my $500+ beater. The peace of mind it gives me is worth it. YMMV.