I think I used to pay almost that much in tax and stoppages in my last job on a 733! It isn't a good deal, but if it get's you through until some better deals come round then all well and good. It's better than the £60 a week or so of job seekers allowance.
Remember that the 733 and the 757 are dead types. Boeing no longer produces them, and many airlines are chopping in old variants for newer as reporting in Flight's Global Airline Census a few weeks ago. A 73 NG rating is worth having with hours in the air too, but 733 experience is not in demand these days. If you have to pay for it Ryan Air might be a better place to spend it!