Little useful advice here. $3k is nowhere near enough to start a profitable casino website unless you are a great programmer, brilliant at customer service and good at marketing. A combination not many people have.
I used to invest in Just dice. There was a large hiccup but overall it was very profitable. I belive I trippled my investment in a fairly short time scale. Ive not bothered since it moved to clams as I could end up with 10 times more clams and still lose money if the value of clams collapses, but I am still tempted.
I have never tried any of the other investment in gambling sites because I either didn't trust the site would exist 1 year later or there was not enough players or house edge to make the investment in the house bank roll risk worth the potential profit. Put simply if there is a 50% chance any site goes walkies with my bitcoins then I want to be able to make 200% in 12 months or I am not going to risk it!
I would love to know if there are any btc gambling sites that people are currently invested in that are making significant long term profits.