Is Raptoreum profitable enough to justify investment?
For the record, I am not doing CPU mining now.
The answer to your question is "depend".
All miner dream about a coin going from penny to few hundred dollar per coin.
Remind me, back in 2016, one evening, I setup few i5-3450 and E5-2650 machines.
I started solo mining XMR , within 28 hours, I hit 1 block ( 8.78 XMR payout ).
Back then XMR price was less than 50 cents.
I am still holding all the XMR that I mine since 2016.
XMR all time high price was almost $500.
Today's XMR price is $244 per coin