I have used Bonus time rates twice. Once was in the off-season (February) and once we reserved a room for one night for my mother-in-law when we were staying on the property for a week.
I have not been able to obtain Bonus time rates since. The universe seemed to change when Welk started outsourcing their reservations. Everything about paid reservations became more difficult and more expensive. Once, we were staying in half a lock-off and had the other half reserved for Saturday through Saturday. Plans changed, and I tried to pay for the Friday night of that half that was reserved Saturday through Saturday. They would not give me Bonus time rates. I kept saying, "I'm happy to pay $159 for that room, but not $240. The room is empty on Friday. Don't you want to rent it for $159?" They absolutely would not budge! We finally grabbed it using points. It was unbelievable. I am not a fan of the off-site reservation company.