> you’re relying on quite a bit of luck that the right candidate will be on the front page at the right time interested in that particular role

Often the way job ads get to people is that somebody happens to see an ad and thinks "that looks like a great job for my [friend|relative|etc]" and passes it on. So it's a wider net than you perhaps realise.

Also, people actively job-hunting will go to the jobs page to see all active listings. But having the placement on the front page serves as an ongoing reminder to people that the job listings exist.