I was at a hardware store in Boise and saw a customer trying to buy a wireless alarm kit for his whole house.
The clerk was just ringing him up without asking any questions about the layout or what he was trying to protect. I think pushing a DIY system like that for a full home install is a bad idea that sets people up for weak spots. What's the best way you've found to politely tell a DIYer they might need a pro?
The clerk didn't even ask about the house layout? That's setting someone up to fail. A pro would spot the weird spots a homeowner might miss. It's worth the extra cost to get it right.