I won about 5k on CS:GO Shuffle. Thankfully sold 4 knives, and a lot of lower tier skins, but lost the rest of the good stuff. Like Patrat said, you'll lose it all eventually hahah.
Just be careful there are a bunch of sites out there and some of them don't value your skins properly... For example, CSGOLounge undervalues just about every skin out there. So sometimes your betting 20$ and they only recognize 14$.. Can be a big difference in the end. It is addicting so make sure you only bet it if you are willing to lose it.
I don't have expensive skins or that many to bet and get a profit, only 1 skin worth more than 1$ and its like 1.30.
I planned on betting for C9 in their match against LG in the iBP cup because they had the odds against them and my profit would have been like 6$ more but I chickened out and they won too, rip ez skins