Unfortunately, yes. However, in many situations, the cost of the treatment is only a little more than the cost of more conventional treatment with crowns and bridges.
There are advantages to it, too. An implant to replace a single tooth avoids the need to cut down the teeth either side for crowns to support a bridge. Normal dentures often mean you can’t eat or speak well, due to the dentures moving about. But teeth attached to an implant don’t cause this problem.