It’s cheap and masks any unwanted smells.

Professional cleaning during turnover is an expense that landlords are usually required to shoulder, and might be necessary even if the prior tenants thoroughly cleaned everything.Common things that tenants miss while cleaning:Leaving ANY (and I do mean any whatsoever) garbage or unwanted things behind.

In addition, what if I attract unwanted attention to the other parts of the property that I strongly suspect aren’t permitted?  

Texas is full of fantastic "unwanted" rural land deals.

I try to contact them when they are about 30 days away from the sale.I then send them a postcard that says We Buy Unwanted Land with my information on it.

For these people it's not uncommon for them to not have built enough equity to cover the closing costs associated with selling a home so they are either stuck being unwanted long distance landlords, or they sell their home at a loss, or possibly break even. 

Only you can answer that.Hope this helps Not to mention the fact that failure to disclose material information could land you into an unwanted lawsuit.

Per the FTC:“The FTC has sued hundreds of companies and people responsible for unwanted calls, and has forced telemarketers making illegal calls to pay more than $290 million dollars in judgments.