According to Nicehash the x10 is making 12$/day. Isn't that good? That's an ROI of 4-5 months.
Indeed it's 4-5 months ROI if things hold. Major risk is asics coming for any of the X10 algos. To my understanding X10 is fpga, it's possible to get 10x speedup with asics.
Another risk is coins switching algorithm.
Nothing risked nothing gained though. Imo just be diversified, have some x10s, some innosilicon a5s, gpus, etc.