[Minomato]

Well, the reason the sniper is more "expensive" is because of the fact that the amount of time it is rented is longer than most weapons. I find it rediculous that anyone would need to use a sniper rifle that long, and I believe it was just put in like that to get people's money before they could test if they really liked it. It should be for only one month, or maybe less, just because it's such a different weapon, and not everyone will like it.
When I won mine in an event, I only used it for a few days, (it lasted for a month) and I got sick of it quickly.