This depends mainly on your electricity price. There are websites you can calculate your monthly (expected) return, so you can make adequate investment decisions. BE CAUTIOUS: Returns are not guaranteed and fluctuated a lot - Most of the times it's way easier (and a better decision) to just buy cryptocurrencies. Furthermore, is mining a hassle and needs constant work - You may think its plug and play, but I can guarantee you it's not.
Conclusion: Its a good tool for learning more about blockchain and funny if you like messing around with hardware, but its probably not a good investment. There are better options out there.