We have a file transfer system in house we direct people to if they need to send large/multiple files. Yes blocking by extension. In fact, our ISP blocks zip now too. So they don't even make it to our level. I'm not positive about RAR or 7zip.
If walls and fencing don't work, I wonder why most of the rich and famous live behind them? Of course they are deterrents. Will it stop everyone? No. But I imagine it will help along with security officers.
Now if you want to talk about spending money on it, that's a good discussion. But the...
I just don't feel like that stuff makes big enough changes to warrant spending the money for it. I can turn lights on and off myself. I'm all for technology but these things aren't significant game changers to me. Just my opinion. But then again, I don't use Siri either and I get along just fine.
I was just going to mention this......I recommended to a friend that goes to Subway once in awhile to try it. He did so today and said it was pretty mediocre for him. He didn't mind it but nothing to great he said.