Hey there Skyler.
The CVP range of keyboards came out in 1997. They were manufactured by Yamaha.
http://www.yamaha.com/publications/keyaction/kajul97/
keyact1.htm
Here's a useful chart to compare the age / value of your keyboard with other Yamahas:
http://www.yamaha.co.jp/manual/english/chron.php
I would think the prices you have seen somewhat over-value the actual instrument, given the depreciation of digital technology over time, but if someone is willing to pay it - around $2000 would seem a price that I would think to be reasonable. The retail price new was $6695
Trust this helps