Thanks, but if its important, no thanks

When I see a problem with a website, I often send a little note.  Sometimes I get a thank you note: like the following:

From MIT AgeLab (

Hi Gary,

Thanks for letting us know about that glitch. We appreciate it!

Sometimes, there is a trace on the web of something I commented on:

If I happen to point out a nasty problem or issue,
I usually get no response, nothing, nada.