I have a rule that if someone asks me about an interesting job, or I’m looking for a new position, I take an interview. It does have to fit into my life, but I try to make time and go on interviews, especially phone interviews.
First, it’s good practice. You get the chance to get asked questions, and then you must come up with answers under some pressure. Even if you don’t want to job, most of us feel some pressure to do well in an interview. These are good skills to keep sharp.
Second, you never know when the job might appeal to you. The best time to find a new job is when you have a job. I’ve learned things in interviews and about companies that made them look at me differently. I’ve never been offered huge salary increases from random jobs, but I know people that have.
Third, you can practice interviewing the company. Many people struggle with asking tough questions or negotiating. Taking interviews gives you a chance to put some pressure on the company to convince you to work for them.
I always take interviews if they don’t severely impact my schedule.