LL.biz domains are being sold for mid $xxx for end users mostly.
Since this is an LN.biz, I estimate it's end user to be high $xx to low $xxx at best.
The buy now price the seller is currently asking is over the price he can get in the near future.
Best to stay clear of .biz domain's investments, they are waste of time and money.
Unless you buy L.biz or a nice LL.biz for reg fee.