Ouch! Double or nothings??? I woulda done 50NL before I'd do some high variance S&G. The way you were running, mighta run up a sweet roll. But, what's done is done. I'm not too keen on your $20 plan. If you can afford to place a 5NL bankroll on the site, then do that. You don't have to grind 2NL to become a good player. Just stick to your plan and quit doing crazy stuff. Can't put it any plainer. Good luck.