Roger from A/G doesn't bother me, sometimes they reply with two 'clicks' the issue is that 'ready for departure' might not mean anything to the A/G operators contributing to this thread, it sure means something to me as a pilot on final.
The point being other than an initial call to A/G for radio check and airfield information all subsequent calls of, taxi, ready for departure, downwind, final are for the benefit of other pilots at an A/G field, not the A/G operator.
If A/G say 'roger' yes it is reassuring that one is actually transmitting. If they reply 'I have a spaniel dog' though it might be somewhat amusing it really misses the point that the objective of the calls is to other pilots. At an A/G field we as pilots have the responsibility of not bumping into each other and the radio calls are generally for that purpose not the benefit of the A/G operator. (Who may well be in the loo, on the phone, dealing with a customer etc etc)