How often is Blackheart Hollow restocked? I've been checking so often that Maleria kicked me out.

Very rarely, like once or twice a day. It's indeed a matter of checking in every time you remember to, and hoping to see an item.

Thanks for the answer :)

there's a random chance she will kick you out, it has nothing to do with you. Even though she may kick you out for awhile the BHH restocks so very rarely it hardly matters that she does. Since there are other players checking often, for the majority of those "kickouts" there wouldn't have been anything to buy anyways.

Persistence is key, but unless the item is selling for like five million sP or more or you are insane like me and going for the Achievement tiers, the amount of time you'd spend attempting to restock it would IMO be better spent doing other sP-making things. With that sP earning buy whatever the price of it is in user-shops from someone who values their time less than you.

BHH doesn't only restock once or twice a day anymore. I don't think there's a set number, but it's a lot more often than that now. I think you get kicked out for checking 3 times in too short of a length of time, but I don't know what exactly the time frame is