grills or no grills on your speakers..matters?

I use a pair of Silverline Preludes with grills off, but the sound is still pretty good with them on (parties, fear of driver poking). I have a beef with much of the speaker design world in that some drivers are very fragile and can be easily dented...Magico tweeters...how happy would you be if some party goer stuck their finger in that tweeter? My Preludes have screens over the tweets so I worry less, but still...some protection for these things seems appropriate and should be designed in somehow without sonic penalties.

I really don't need the grills on my Preludes as they do have screens on the tweeters...I dust the woofers from time to time as tiny dust particles do not deserve to ride around on my drivers. I put new grill cloth on my sub as it had been damaged by the previous owner, and I can't imagine it blocking anything under its 50 hz or so frequency range...so it stays.

Instead of grills, I've found that a small electric barbed wire fence around my speakers can keep the drivers safe...I found that using a moat full of piranhas was simply not practical, and the cats kept disappearing.