Let's say you're a good, experienced developer. You get 10 recruiter messages per week. You ignore most of them but 1 in 20 you decide to read. There's a 10% chance that the description looks like a good fit. You contact the recruiter and tell them your salary requirements. There's a 15% chance that it's in your range. You decide to set up a phone screen. But, since you're valuable to your current company, you're extremely busy. There's a 20% chance that you can make the call.
I'm too lazy to calculate that, but that's a huge number of people to contact just to phone screen one good person.
Let's say you're a good, experienced developer. You get 10 recruiter messages per week. You ignore most of them but 1 in 20 you decide to read. There's a 10% chance that the description looks like a good fit. You contact the recruiter and tell them your salary requirements. There's a 15% chance that it's in your range. You decide to set up a phone screen. But, since you're valuable to your current company, you're extremely busy. There's a 20% chance that you can make the call.
I'm too lazy to calculate that, but that's a huge number of people to contact just to phone screen one good person.