I noticed that Affinity software is capable of detecting that there is another Affinity software installed on a computer.
My suggestion is, when Affinity noticed that you have all 3 software installed. When you open the last software you bought, the first thing you see is somekind of a letter from the developer titled "Achievement completed : The Holy Trinity" or "Thanks for the support" or something like that.
I think this is a simple thing to do but have great impact on making you sound less like a corporation but instead sound like a person.