The only problem I can think of is the wireless control died in the only one I ever installed, because there was no wall switch in the room. 

Many of the newer wireless internet devices will store a short amount of video for free.

I am currently in the wireless construction industry and looking to invest on the side.

@Jason Duryea thank you for your reply.That’s a very good point to encourage wireless in the rest of the house.

A wireless lock with a code that can be changed after the people leave. 

Any suggestions on wireless systems that that have online access and cloud storage?

My borrower bought a vacant former bank branch and re-tenanted into a dental office and Verizon Wireless store. 

I did purchase a small wireless transponder from my cell company to provide the signal, so that costs me about $35 per month. 

Under the CAN-SPAM Act, the FCC can regulate commercial texts sent to wireless devices to protect consumers from unwanted mobile commercial messages.""

The wireless locks and cameras are an added expense, and I would imagine that it is too much trouble to have an internet service setup just to cancel it a week later, unless part of your business model is to include basic internet services.