Let's clear up a myth. "Cell tower lease buyout firms will pay almost anything to get your cell site." This is patently false and has caused many potential sellers to have passed up great deals and cause many more to hold onto their cell tower leases waiting for a buyer to pay some unrealistic price (value) that will never come to pass.
Let me breakdown the perspectives of cell tower lease buyout companies. First and foremost, these firms measure risk/reward when looking at a cellular site's value to them.
The risks are real. Present redundancy or potential redundancy due to technology or newer and cheaper tower sites becoming available. Historically, although thousands of new cell sites are built yearly, 1 to 3% of present sites are terminated early each year.
When your cell site is sold (transaction closed) and then the carrier chooses to cancel the lease, you are not liable. The cellular buyout firm is stuck, not you.