Disregarding the fact that your advice is clearly biased towards the kites you sell, spending $1650 on a first kite is arguably one of the worst decisions a kiter can make.
Yes there are some good second hand kites around that are cheaper, and if you can find one, and this guy knows what to look for when buying a 2nd hand kite, then thats a great option, but in most cases a kite that is 2 seasons old will start to deteriorate quickly, especially once a beginner starts to crash it repeatedly whilst trying to get up on the board.
If on the other hand the guy buys a new kite, familiarises himself with the local shop, instructors and crew, and makes the most of the service, training and professional advise, he will most likely enjoy and stay with the sport, be lead in the right direction from the start, and be encouraged in every way possible to keep him progressing quickly to the intermediate stage in months.
Ive been in this industry now for nearly 12 years, and have promoted and taught thousands of students, and buying second hand kites from unknown sellers (not shops) is where some fail. The money that is needed to keep these second hand kites working every session and safely out weighs the initial saving made. Your kite is the most important part of your equipment, and needs to be the part that you spend the most of your money on. The board can be your money saving area because most boards last a long time and there are some real bargains to be had.
This info is based entirely on what we have witnessed over the last decade, and is biased to the brands we sell, because we chose to sell them. This choice is based purely on quality / performance / backup service and warranty.
Joe