It depends on your circumstances and what you want to get out of it. I'm new to mining, it's a learning experience. I'm gaining a large amount of hardware knowledge and it's introduced me to crypto in a relatively low risk way. The cards I use haven't lost any resale value as I bought them used and I'm looking after them in terms of temps and fan speeds. This also mean my ROI on each card is less than 3 months.
still new with mining as well and from each day that passed difficulty shown from time to time and if you are going to do it expecting for profits better to think twice mining will take some time especially if you will going to mine coins that will have a good future holding and waiting for it will give you a lot of profits.