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Stuck valve, loss of pressure. Risky or only poor performance?

I have a 1998 Toyota Tacoma 2.7L 4cyl with 202,000. The engine has been running rough and will occasionally sputter and die when I let off the gas pedal. I had it diagnosed and they think it's a stuck valve. One of the cylinders had less than 50% compression. I was quoted a minimum of $750 in labor for a machinist to take it apart and any parts will be extra. I have been driving the truck in this condition for several hundred miles.

Am I risking further major damage or am I just getting diminished performance?