Hi Joe - TBN has gotten pretty big - the fossils don't take as good care of new members as we used to - often the collective wisdom is taking a nap when somebody asks a question like yours.
The L2250 was a nice little machine - very reliable, solid, strong. If this one really has only 1100 hours and has been well kept by a single owner, it might be worth that much - but it is a high number. The hourmeter drive cable routinely breaks around 700 hrs. Sometimes its a few years before someone gets around to replacing it. Best to just ask if the owner knows the whole history. Bottom line is condition is everything on a machine of this vintage - if it is nice, the owner will eagerly tell you all about it. If not, you'll be able to tell. For $15k it would need to appear nearly new. The Kelly backhoe probably doesn't have a subframe so it is of limited strength and maybe not worth a lot ($1000). A price of $10k or less sounds more in line.