If you can easily sell that many skinspikes, keep selling them until he runs out of plat. If you lack the resources to do so then you know its whatever. in wow there was a dude who hit gold cap twice when it was more difficult to make gold and he had a blog and had many tactics for making gold, some requiring no effort other than keeping a database on prices through an addon. if he keeps buying your skinspikes, he doesn't recoup the plat until he sells them. if you can consistently sell more of them then you win.