This is how I make hundreds doing this. First off you CANT be betting red or black, their payout sucks. Focus on the columns and 12's. Each are (theres 6) 2:1 odds. Meaning if you are betting 1:1 odds with black and red, if you lose your initial bet, you have to keep betting to break even, which sucks as a strategy. I want something that pays me more as I bet more.
This is my strategy, get a drink and walk around the roullette tables. Look for a board (an electronic ledger for everything) that has hit in the last 18 spins.
Find a board where one column or 12 hasnt hit yet, once you find one, put the initial low wager on the number. If it doesnt payout, bet it again, however dont raise your bet YET. This is the only game you can bet again, if you win, you made a profit WITHOUT raising the stakes. If it didnt hit the second time, double down. Keep going till you hit 1250-2500 or the table max.
Lets talk about some things required to make this work.
1. If a 12 or column number doesnt hit in 18 rounds, thats called an order of magnitude of 6. Odds a 1:2 odds bet hitting is 1 out of every 3 rolls THEORETICALLY. If that odds doesnt hit in 6 rolls the order of magnitude is a 2.
Also, the chances of an order of 6 magnitude happening is 1x every 2-3 hours.
I used to use this strategy when the event of a column or 12 number not hitting for 9 spins, but coming across the 6 magnitude event can wipe you out. So thats why I suggest gettting a drink, it requires patience to wait for that to happen.
If you find a 6 magnitude event, going through a 10, 10, 20, 40, 80, 160, 320, 640, 1280 spree is of the order magnitude of 9....which is very rare.
I used to get free buffet and gambling coupons doing this all the time, before I got engaged and had to be more responsible.
Also this technique requires table minimums of 2,500-1,500 max bet on the outside bets. This wont work with a lower min table, hou will be hitting the limit without building up rarity in the progression.
Finally, this doesnt require paper, software, etc. just patience...