I really dont think the operators are short on pilots....or at least short enough to hire pilots. You´ve seen many adds.....but no answers.
Well Berlioz you have UK North Sea pilots here telling you otherwise. Having a few hours and an IR is only the first step. The operators have to feel that you will fit in and justify the training costs involved so maybe there are other reasons that you are not employable. If you have a job onshore - either corporate, HEMS or whatever - then I think that you would quickly tire of the tedium of offshore flying. Maybe they do too.
Their ideal is an offshore experienced and fully qualified, type rated pilot from one of the other operators. Next in line are very low time pilots with no type rating who can be moulded to fit the offshore mentality - and accept a low staring salary and bonding.