If you have a smart phone you should check out the various scanner apps.

This is a device you an use with your smart phone to accept credit card payments.

Probably depends on your state/MLS, but I pay about $14/month for electronic key and access using my smartphone.

Don't underestimate people, just because they are down and out, maybe lost jobs, etc. doesn't mean they don't have smartphones and internet service, so that they can look for work, etc.

There may be no reason if you can just hit a button on your smartphone and the nearest car drives to your GPS location and takes you where you want to go without needing the expense of a driver.

It does not need wifi access to operate and you can generate the code from your smart phone.

When I pay people to hang up signs for me I make sure that they have a smartphone and use an app called evernote.They then take a picture of every sign that they place and the app/phone records the location on a map.

But as a property owner/landlord I can see the issue with ROI of the equipment and monthly monitoring.That said, I think the more you can use your security system to provide tenants more "home automation" features (i.e. controlling lights, thermostats, locks, etc.) from their smart phones, I think that is where you may be able to recognize some returns, especially in "A" and "B" class neighborhoods.Just my 2 cents.Lee

I'm probably not going to invent the next successful smart phone app.  

When I checked it out on my smartphones map app, I found it's in a neighborhood I used to work in and is a few blocks from the University of Toledo.