I play it a bit when i'm in, the most i've flung in is £20 at one time. To be honest, the most money I really win is when I go in and don't put too much in, just use loose change. For instance went in one time with £1 got myslef up to £10 then kept repeating the spin untill the win/loss didn't cover the bet, walked out with £91, £90 profit!
When I play I use a system, it's not a system that gives my probabilty to winning a greater chance, it's just neighbour bets, for instance, my birthday is 16 so i'll put money on 16 and the two numbers either side, 33, 1, 24, 5. Do this with another 3 numbers, say the other 3 parts of the wheel, that's when I generally win with loose change. However it is highly addictive and I have friends who've lost more than their monthly wage in casinos on nights out, just idiotic betting like walking in and placing £400 on red.