I can confirm that mining of alt coins is good, there are the popular ones such as zCash and ETH. But it will always depend on your mining rig but also the investment you needed for building up your mining rig or farm is not that cheap. You should invest bigger money in able to get better results.
You right. I use just my gaming PC with s 480rx. Very nice card I got it about 3 months ago and I have got roi plus 25% profits which will be more when the value goes up for the coin I'm mining. I might upgrade a second pic. But ya I have no money for an actual rig yet.