It's reasonable to collect many varieties of Sinningia because the plant aspect as well as the characteristic is quite different within this genus. For me the most important is the renewable growth which makes Sinningia as an easy plant to handle with no hesitation.
As mentioned it's very possible to own too many Sinningia, one may become meaningfully picky when making collection. But one always has a free space for a micro miniature Sinningia. Please remember "Penny and penny laid up will be many" ... what a golden saying ! But when such situation does happen in front of you, a golden saying is a mere platitude. Now the poor growing skill may turn to be a favor to solve the dilemma.
Unfortunately, Sinningia is good at survivor games when the outside condition becomes bad. So I said the renewable growth is an excellent technique of Sinningia.
So ... Sinningia for you makes sense !?