If the way the concierge gets sold out Met tickets is by going to a ticket broker for a healthy premium over face, that isn't worth $100 to me. Probably not even worth going to a concierge for that. There is hardly any event where enough money won't get someone to sell, I don't call that a miracle.

I rarely, if ever, tip housekeeping If valet parking is charged, and especially if it is mandatory, I cannot imagine giving $5, more like $1 or $2. If a (usually substantial) service charge is added to room service bills, I won't trip.

Too many of the ridiculously generous tipping "rules" seem to be set by Manhattan residents, who are untypical of the rest of the nation -- these folks are currently claiming that taxi drivers should be tipped 30%.