re: Poker & what makes a grinder a grinder?
Where You Can Find Grinders
Actually, you can find grinders in almost all types of poker in the lower and middle limits. You typically don't find a "grinder" per se at the nosebleed stakes. Most grinders will multi-table to the tune of eight or more simultaneous tables, oftentimes of identical game types and limits. For instance, a Sit and Go grinder might play eight tables at a time of $25 turbo 9-person Sit and Goes. Considering that 10% (after rake) is a great ROI for a Sit and Go player, that means that the player is only making $2.50 per sit and go. But if they can squeeze in 20 sit and goes in an hour, then they're "grinding" a $50 per hour win rate. By contrast, if that same player decided to go play a $200 Sit and Go, then they're now "off their grind" and taking a "shot" at a higher game.
You Should Also Know...
While some grinders do play almost exclusively large, multi-table tournaments, these people are a very rare breed. The goal in a large tournament is to make a big score, to win a sum of money that can sustain you until the next sizeable take. Some people are able to win small to medium prizes on a fairly consistent basis, but in general, grinders don't specialize in multi-table tournaments because luck can swing one's results too quickly in them and they take too long to make smaller wins worth the time.
Additionally, online players can earn rakeback to increase their hourly rate, and some online poker rooms only offer rakeback for cash games.