Because I am likely to resign my teaching job this June, and "word has got out". I am inundated with offers. I have just received an email from one recruiter listing 25 jobs they can guarantee me an interview for next week.
I don't have much faith in the honesty of agencies in general, but a quick google confirms the ones I have checked are genuine vacancies, and genuinely interviewing next week.
Out of the 25, if I were job hunting ( which I am not, if I stay in teaching I will stay where I am) then 20 would interest me. The other 5 or either jobs I am not qualified for, or jobs with a tricky journey.
I have other emails from other agencies, and some from schools directly.
This is the worst it has ever been. I have been subject to such aggressive recruitment before, but in previous years, only say half a dozen jobs at a time, never more than 10, at the most.