I see the reward is very low but I think the testnet coins should be worth at least 1% of the mainnet price
But even BCH and other forked coin doesn't even have 1% of BTC price.
you need an ASIC if you don't want to wait for the 20 minute difficulty reset to 1.
I tried it for about a week, and never hit a block. CPU mining loses from ASIC even if the difficulty is reset to 1.
Even at difficulty 1, using ASIC would allow you to find block in far shorter duration. Using simple formula[1], i found that using CPU is nearly impossible.
Core i7 3930k (6 core)[1]
average time to find a block = 1 * 2**32 / 66600000 = 64 second
GekkoScience Compac F
average time to find a block = 1 * 2**32 / 200000000000 = 0.021 second
You'll need far faster hardware (e.g. high end GPU) to close the average time gap and hope you're faster during block propagation.
[1]
https://bitcointalk.org/index.php?topic=1682.msg63066#msg63066[2]
https://en.bitcoin.it/wiki/Non-specialized_hardware_comparison