I hate to say it but i'd say if you took 100 random hardscapers and had 50 install a patio on concrete base and 50 install a patio on a gravel base, i'd bet money the ones on concrete would last longer. WHY? Because almost no one uses fabric. No one understands soil types. No one uses enough base. No one compacts enough. Its a shame that people cant figure out the simple concepts of building a paver patio. It isn't rocket science.