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.
lol,
We did the same thing. We started a few months ago buying used gtx 970s off Craigslist and Facebook marketplace for 100.00. You can always find someone that needs money really bad for bills and things like a computer or computer parts are the first thing to go. We just kept adding what ever cards we could that were cheap.
Even with prices coming down if you were to get into mining at this point with new gear I think you would have a tough way to go. I don't think its too late if you want to get in with cheap used gear.