If you think it's worth $50/y, you could price it there, and then offer a $5/m package as well. If the $50/y scares them off and they go with the $5/m package,

If you think it's worth $50/y, you could price it there, and then offer a $5/m package as well. If the $50/y scares them off and they go with the $5/m package, then you're making an extra $10/y off them. If it doesn't scare them off, then you're making your $50/y. I would hesitate to pay $50/y, but not so much $5/m.