Still worth to buy a Mining Rig?

It really depends on on where you live, how much electricity you use and pay for and what hardware you're using. At this point it's very hard to say if it's worth mining any currency, especially bitcoin as it's pretty unstable. The moment you've reached 1 bitcoin, it's value might have plummeted back to a couple hundred dollars. Mining was good when it started as it was going to be a bubble, it was pretty apparent from the start. The people that had thousands of bitcoin while it was a few dollars and sold back at 22k, they're now millionaires, however as banks purchase and sell bitcoin it's never really going to go back to what it was, it was all a bubble.