Orpingtons don't have a reputation for being stellar layers, and they do tend to go broody. that may well be what your person was thinking, when saying the cross would be useless.
but, you know your particular birds and goals. If your Orpingtons have the traits you want to pass on, by all means.
I find most backyard folks I sell to aren't very fanatical about how many eggs per week they get. I mean, they have birds for eggs and want to get a decent amount, but they're just as happy with 5/week as they would be with 7. Getting a guaranteed pullet is more important to most of them. Add in pretty and friendly and you'll have a nice little market, if that's your goal.
but, you know your particular birds and goals. If your Orpingtons have the traits you want to pass on, by all means.
I find most backyard folks I sell to aren't very fanatical about how many eggs per week they get. I mean, they have birds for eggs and want to get a decent amount, but they're just as happy with 5/week as they would be with 7. Getting a guaranteed pullet is more important to most of them. Add in pretty and friendly and you'll have a nice little market, if that's your goal.