Although you have pre-ordered, here are a few more arguments:

a) it is one of the greeniest hobbies (no fuel consumption; no CO2 production, no garbage production, no regular oil changes,no weekly wash using tons of water and polluting soap, etc.)

b) it is one of the cheapest hobbies (no plates to renew every year, no annual permit to pay, no tire to change in Fall and Spring, no extra costs for insurances, no need for a trailer, no need for a garage, pro gears keep their value and resell at almost the price paid for originally, etc.)

c) it is one of the most family-friendly hobbies (camera can be used for family activities, a lot of time is spent at home when post-processing and reading books or forums so you're always only a call away if family needs you, it is a hobby which can be practiced by everyone including children, you can produce personalized gifts such as your own calendar and mouse pads for Christmas or special events, etc.)

d) it is one of the most spiritual hobbies (you have to learn how to observe what is around us, to appreciate details you would not pay attention to without a photographic eye, you have to slow down or stop to simply see the beauties around you (a luxury activity in today's speedy life), it helps you to meditate to put you in an openmind or hearthy feeling in order to produce the best photos conveying the soul of the place or activity, etc.)

Well, I hope my English translated properly my ideas,

Cheers,

Yvan
Quebec Nikonian
http://yvanbedardphotonature.com