historically and by that I mean prior to Nov 2012, CL futures would commonly range $2,000 - $3,000+ per contract intraday, with several different $1,000+ oscillations inside. So once you got the hang of things, it was pretty easy money.
from Nov 2012 to date, volume and volatility have contracted greatly. That doesn't mean it' s poor to trade... just tougher. A lot of the former CL guys have washed out and quit since then. Like anything else simply takes adjustment.
pros to CL versus ES:
still has more oscillations and ranges than ES intraday = more opportunity to finish profitable
pros to ES versus CL:
much greater liquidity (non-issue for most individuals)
more methodical price movement, i.e. far less algo explosions
less radical chop
half the margin for ES than CL... so you could say trading one CL contract is equal to two ES contracts
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ES is fine for anyone to trade. CL is superior in some ways for experienced, skilled veterans to trade. If you go on tilt and try to fight the market in CL, i.e. pulling stops, averaging down and all the other stupid stuff, you will go broke much faster in CL.