Some people here like to hike. Some of us like the camping aspect more than the hiking. And then there are people who enjoy shopping for gear more than they like camping or hiking. Most of us are a mixture of those three.
It all adds up...even the person who thinks they only spent $300 on their gear probably isn't counting the $110 pair of hiking shoes and the $45 shirt...just because it doesn't go in your pack doesn't mean you didn't spend it. You're probably just more honest about how much you've spent. Its like anything else, you can spend a lot of money on a hobby.