While I think it's great to stay in the rhythm of things and really get your interview skills down pat, to me the idea of applying for a job when you don't need one is a bit arrogant and selfish. In the grand scheme of things you took a potential interview and maybe a job away from someone else who might have really needed it. It's great that people want to help themselves but doing the right thing and being nice can go a long way--if you really want to brush up on your interviewing or just not lose touch of the corporate game there are a lot of career centers out there just itching to give you tips and encouragement. I'm not taking away from your message about companies and their hiring practices in general but don't forget about what really matters.