I live in states and and arbing is making me a very nice 2nd income. Hell some weekends I make more than my job. Was it as easy or profitable as 5-10 years ago? No, but I make a LOT more than $15/hr, especially during football season. The books are catching up sometimes it does backfire---their lines are not as off as before. I also notice a LOT more people are doing it (you can tell how quick an arb line evaporates, get stuck with small loss on quickly changed lines etc.) but those are casualties of war. Ive done this for almost 10 years now and still find holes where good profits are available. I have been limited/kicked out, but some books (to my amazement) continue to take my action. I will ride it as far as it goes. Live arbing is suicide, why even consider that when your window is like 5-10 seconds sometimes. But if your looking to do this with a small bankroll, its very tough to make it worthwhile.
If you do some research you can easily find which books are arbable and find their weaknesses. Of course you risk tying up a bunch of money offshore, then trying to explain to your wife your not gambling (good luck with that one) and always under the radar, and marked on the books blacklist. But again somehow have survived so far.