It was a bit profitable only using Raspberry pi 3 earlier when the XMG was around $0.2~$0.3. Compared with its electricity usage and the amount of XMG in returns. Used to have ~1.5XMG in 2 days with good config.

With now XMG reached above $1, more stronger miners are joining the network, making rewards on small mining rigs like Raspi goes down.
Since this coin is one of the first to use POSII, I started to mine with my old computer. And hoping for another pump in the forseeable future.