There is a desire for high end rifles but in terms of commercial success it is quite a difficult market, look at impact airguns they tried but unfortunately it wasn't to be.
Off the shelf I think are/were fairly priced depending on where you buy from and £600 is what id be prepared to pay for a top end standard gun, If your talking venom type standard off the shelf i.e. nice stock/finish high spec tuning etc.. then £600-900 because as we know high end rifles from the likes of Venom, airmasters maintain and often gain in value so your not going to loose out of pocket and built to last.
The more desirable collectables I.e TX200SR, ProTarget and Theobens only attract higher prices now because they are no longer produced and bearing in mind getting parts etc is getting more difficult. I personally would only pay up to £350 now for a theoben because of maintaining and servicing issues. What I would say is that for Airarms not to continue making the SR, Pro Target etc if they were so popular doesn't make good business sense.
Weihrauch HW97 .177, Weihrauch HW80 .22, Weihrauch HW77 .22