I've gotta say something about this, as it happens quite often.
I can remember the sales thread, and l'il Gil was all hyped up about selling some comics for a "big purchase" or something, and he sounded all desperate, like he'd sell his first-born to get the money. It's a tonal difference, as many people sell to buy something, but you could almost hear him slavering over his keyboard when he typed.
That set off some alarm bells, as I've seen the exact same MO play out on the boards, and usually the guy gets the money and you don't hear from him again.
Who knows why, maybe it's seller remorse, maybe his original deal fell through or he got ripped off, and he doesn't feel obligated to follow through on his other deals, but I never buy comics from a Desperate Collector, as their mental frame of mind is usually not the best.