Well,

If I got a barn dance booking I do in some cases get asked for Scottish or american or English - I can oblige.

I am being booked to provide what the person paying me wants me to do. If I get an open ended booking then I give a cross section of my favourite dances.

If they don't tell me until after we have an agreement then that is tuff they may get what they want but....

I see nothing wrong in this. If that is not what you do or want to do then you refuse the booking and live more frugally!

Andy