Most things on Second Life are fairly priced when you take into account the conversion rate. That being said it can be expensive if you go overboard buying stuff, but buying things piecemeal is pretty manageable. Or at least I think.
But as @RowanMinxsaid, Second Life isn't a necessity or basic human right. It's a luxury. Even if things were ridiculously overpriced it wouldn't matter. Linden Labs and content creators, as well as resellers, can charge what they like. The option of not playing/buying is always a valid option.