Cobbhead, I completely see and agree with your point about opening the chokes on a gun too much that it kills the resale. I've found that I either fall in love with a particular gun and keep it for a loooong time, OR use it for a year and then it gets moved along. Opening to CYL/SKT does kill the secondary market when you go to move it. I spoke with my local dealer on the same issue a while ago and he agreed- IC/MOD is the classic combo that will always sell. Less than than on a choke combo and you are pigeon-holeing a gun into a certain hunting style. Only close bird hunters will want CYL/SKT gun.
The solution I've found is the RST Spreader Loads. They do make a huge diff in the guns I've been shooting, just be sure to pattern them and see how they do. Also PolyWad makes spreaders too.
.02cents.