Does honda recomend when you should replace valve springs????

I'm not doing any internals, and have read that I shouldn't get anything for high performance because it will add to much load to the valvetrain. So I'm looking for OEM.

I know that you are suppose to get a valve adjustment every like 15K.

Sadly I haven't gotten, or done mine in well over who knows how many miles, even though the sound of them is so annoying.
She now has over 160K miles on her, and I'm wondering if I should get new ones, or just get the adjustment. I tried finding someone that sold stock springs, but the only one I found was honda, and it was over 100 for all 16 springs. BTW: How much would honda charge for the valve adjustment?? I asked at Pepboys once and one of the guys there said they would charge 1.2 hours. I thought about doing it myself, but am kinda lazy about it. This weekend I'm hopefully going to get to put in my suspension, so if there's any money left I will probably be stopping at honda to let them do it.

PS. What exactly are the cons of not adjusting the valves... other than the annoying sound.

Kind of a dumb question... but does this affect the exhaust sound as well? I've been wondering that lately.