On the server save of April 15, 2019, house rent increased. Back in March 2019 I bought some Tibia coins for 21k each through the same market in Pacera which is an optional PVP world existing since 2004. Since the house rent increase Tibia has done other things to make the money go around in Tibia. They've also implemented hunting ground changes and item changes
I firstly answered this in April 2020 and my answer was one of my houses (Lucky Lane 1 in Venore) rent went to 800k. Also, my house price went from 55kk to 20kk due to house rent increase during that time frame. I remember a lot of inactive players left there houses and even lost them because of the change. Tibia coins were around 21-25k throughout this timeframe. No one was buying houses, however now in December 2020 my house is worth 60kk+. I get offers for over 100kk on it all the time lately. Tibia coins are now around 26k-27k these past months.
It's important to know Tibia Coins can be affected by numerous factors: events like stamina bonus, rapid respawn, XP and skill events, double loot, new worlds, situations in real life (example: coronavirus where we're most of us our quarantined at home), holidays, type of world, population, etc. I think with Coronavirus the year 2020 we all forgot about the house rent increases because a lot of us our back playing or have other things to worry about.
So ultimately, when the house rent increase came, we were all worried and a lot of people left their houses or sold their house for cheap but Tibia coins stayed around the same and then actually increased in my world, Pacera.