I think it's a simple reply to Steve's question.

Investing in your career on your own is important UNLESS you are sure that you will be working where you are now for the rest of your career.

For those of you out there who are learning things and then don't feel you get to use them, remember that you are gaining the reward by adding to your resume, and representing accurately to future potential employers that you are self-motivated and willing to put in the time to learn what you feel is important.

If you don't care whether you make your next job search harder or not, then by all means, don't waste time and money investing in your career.