Short answer? The service is still incredibly small and posts aren’t usually flooding in second-by-second like you may be used to on the much bigger sites, so one over-agressive user can easily dominate the front page for a while, purposefully or not. That’s just going to happen.
If you’d rather not block the whole community, hide the individual posts as you spot them to free up your feed again. If one user keeps dominating your feed, just block them. That’s the best we can do as regular users.
Wonder how much they’ll raise it next when they lose additional sales to absurd prices.