Indeed. If your LFG post doesn't have any concrete information about you, your play style, time zones and availability, or what kind of game you're looking for, then there's very little to garner a GM's interest. If the post has gone without a hit for a day or two, it's not going to happen. Finding a game, either online or offline, is often a week or more of checking posts multiple times a day to find a game that suits what you're looking for. Don't get discouraged if you don't find one in the first 48 hours :)