Apartment and car shops are among the highest paying shops, per hour. There's no purchase necessary, either! Onsite, I'm out in under 45 minutes.
This week, I've shopped apartments. 2 bedroom, 2 bath. One location rented for $700 per month, and the other rented for $2010 per month! 6 miles apart. The report is the same, but the onsite visit is eye-opening.
Car shops are similar, but can take more time on site. It's kind of fun wheeling and dealing for the best price for a vehicle you have no intention of buying. And, it's definitely good practice for when you are ready to buy.
I have no complaints with follow up. Most reports have a section dealing with the lease agent or salesperson follow up. I either let that call go to voice mail, or provide an email address, if allowed. I have very rarely found that such calls are relentless. If so, I would actually answer the phone and relay that I rented an apartment, or purchased a vehicle, elsewhere.
A helpful hint is to add the incoming telephone number into your cell's contacts. That way, it will be ID'd, when it's incoming.