I would not recommend this unless you hire these people for a regular maintenance role. Leaving a box with no monitoring and no on-site skill capable of fixing

I would not recommend this unless you hire these people for a regular maintenance role. Leaving a box with no monitoring and no on-site skill capable of fixing it is a bad idea. That box will explode at some point and it's going to explode at the worst possible moment, and you'll loose tons of business (and/or data) while you scramble to get someone to repair it. Unless you have people ready to jump in and fix it should it break, don't risk it and just let Heroku handle it.