If you look at the recent (24mo) sales on similar names we see onlinejob.com sold for 5k and dlsonline.net sold for 2.2k in "05". But most telling is "shoponline.net" selling for 5.9k early in "05".
This and the key words ranking amoung the top ppc ad bids and most desirable to end users make this a healthy candidate for venture.
buyonline.net should see mid to high $$$$ and considerably more once developed. This name will get developed by someone.
Good name .....Good luck
namenut