I donated 10 € and hope this helps. Anyway, as far as I know you have some programming skills. So wouldn't it make sense to not only selling your N900, but to offer some work, like porting some older SF programs to aarch64 (just as an example). It doesn't have to be overcomplicated things. But I think if you'd offer that on https://forum.sailfishos.org you would have good chances to get some money, even though I am aware that you will not become a wealthy man with this.