It probably depends a good deal on the pricing of your listing. At certain pricing levels, they may have been used to having a concierge desk in a similar tier of hotel.
Our most frequent requests are for phone and computer chargers. Phone chargers, I can understand. People are so connected to these devices that I can understand the request. After a while, I just started leaving an iPhone and MicroUSB charger in a basket on the display shelf with our travel guides, etc. Computer chargers, on the other hand, are a good deal more expensive. Not long ago, there was a guest who demanded we buy him one. Sorry, we won’t accommodate $85 charger requests.
The next most popular request is for a ride to the store, mall, etc.
After that come the requests to leave a car on the street or in our garage while they fly out of the country for a week or two.