Having a bankroll of a quarter million gold has allowed me to consistently buy enough items to have a full 10 slots of items up on the RMAH. Making money in Diablo 3 is not a get rich quick scheme, it's a marathon of making a little bit here and there and adapting to find new markets to squeeze out margins. I'm still making between $5 and $10 every day with about an hour of total work (half hour in the morning and half hour at night).
I'll continue to work with this bankroll for a little while and continue to pull some extra cash out of this game. I plan on slowly experimenting with the higher end markets, many of which are discussed in Markco's Gold Forum and his Gold Guide. Instead of investing in items with 1-5 million, I'm starting to set up to buying items between 10-20 million gold and selling them for 20-35 million. They move slower, but the profit margins are better.
For those of you grinding out there, keep it up. This concept seems to be working for Blizzard and I expect that other games will come out that will have similar real money auction house set ups, based on the model that Diablo 3 is providing. Just image, if there were 10 games out there like this with real markets and you were making $5 to $10 per day on each, you'd be pulling in $50 to $100 per day by selling virtual goods.
Who'dathunk - pixel traders as a profession.