Four reasons Mike.
1. for autoguiding on dimmer stars than I can reach with the ToUcam
2. I have two good mounts (soon anyway

) two good imaging scopes, two laptops, two eyes, two pairs of hands but only one camera (well two actually but I find film so frustrating and wasteful) so a second imaging piece would be great.
3. I've been asked to run a 10 week basic imaging imaging course up at the observatory and it would round out my imaging "quiver" nicely for the classes. I'm even thinking of trying to pick up a cheap second hand LPI as well (mine went with the LX200 when I sold it to iddon). If the first is successful we'll run at least one a year.
and
4. I've been hanging round houghy and Striker too long.