Free rooms and $20 trick?

I booked 4 nights at Harrahs using my rewards card and can stay for free in the south towers. I was wondering if anybody has tried the $20 trick on comped rooms and do you think it might work ? it would be great to get free rooms and be able to upgrade for $20..

I've personally done it twice at Bally's. First time I was traveling with my brother on a guys trip and was upgraded to a renovated North Tower room overlooking the Fountains and Ceasars. The second time I was with my GF and was upgraded to a mini suite (though I did tell them I was going to propose to her during the trip, so that may have helped as well). So, it never hurts to try.

Harrahs doesn't have N. & S. Towers........thats at Ballys.

Harrahs has Mardi Gras & Carnival towers. Both have their pluses & minuses.
Higher floors the better. I like strip view, Diamond levels.

Probably depends what your Card Level is?
If you are Gold, I would just ASK for a High floor & see what you get.

If you are Plat. or Diam.? Go to those check-in areas, and see what they offer.