It's been a while since I have posted here so thought I'd chime in..
I'm still arbing. I started in August 2012 and still going strong. I probably do about 4 hours of scanning per day 7 days a week, mixture of day and night but I find the international races still better.
Last night I did one race then logged off. I made $563 from it and arbed it for about 2 hours straight until it raced. It was Gowran Park, race 2 and it was a quad arb (4, 14, 15, 18) which was perfect as the profits and losses on Betfair offset each other increasing overall profit takings. I still have my trusty bookmakers which I've used for over 12 months with no sign of stopping. I won't be naming them although no doubt many of you would use [some of] them anyway!
I got a new setup a few months ago as my old PC was running slow. This new thing is a beast and does the job very nicely. I also have back up internet in case there's ever a problem. I have a special widescreen laptop too which split screen ability. Once or twice a year i might back and then our internet goes down before being able to lay. In the grand scheme of things it doesn't really make a dent, but it's still annoying.
The main thing i'm trying to do this year is cut down on stupid mistakes. Discipline is definitely the key! The main ones being: backing for place then leaving it too late to lay, then the market suspends. Also, assuming liquidity will come in for the lay (AUS) and getting stuck and trading out for a loss. I would say I lose about $300-$400 a week on average in stupid mistakes so i'm really working on it now. If you multiply that by 48 weeks it's a LOT of lost money.
I've also been using other bigger bookies like Sportsbet for NSW racing which is good. I've spoken to Richard Irvine and a few others and they think other states will bring in similar min bet rules by the end of the year. I doubt it myself but we will see! That would be amazing. On a similar note I haven't noticed any less arbs on NSW races since the new rule. The holy grail for me would be min bets on ALL racing (international mainly), but I can't see that happening either.
Hope all is going well with you guys!