[silicon2401]

That's a fair point but to me that's already built in to job hopping. If you're not able to secure a new job (or hold down an existing job), then you keep progressing, but at a higher salary. I work for money and nothing else (I couldn't care less about software) so I gain no benefit from doing the same thing (growing my skills) at a current job than at a new job with a much higher salary.