Only with no deposit bonus, i had won over $5,000 using only the no deposit bonus in a ton of casinos, but i have lost around same ammount doing deposits, its not more attractive for me to play at casinos, even with no deposit bonus is hard to get some winnings, but when you hit a nice feature, the winnings are high, thats true.
No, is not worth and for me is really addictive the escenario of win 3x my deposit, lose it, deposit more, win 1.5x and lost again, deposit and lost again... is not attractive more for me, but was years ago... its a sad game that i enjoyed when was using amphetamines and nothing more to do.