You're the operator. You should know better than 99% of Pinsiders.
My opinion -
Pro: If they are asking for it they are planning on pumping money in. If they are paying $500 they want to make that back in fun. And then the resale afterwards.
But, how long before you normally rotate games?
Con: When profits start to drop are they going to get pissed when you want to pull it? Are they going to say "Hey, we put $500 towards it and want to to stay". If it gives them some say I say "no" it puts someone into your business. If you were not going to do it go with your gut.