I think your overabundance of accessories might be hurting you. As it happens I'm looking for an N810, but I'm never going to have use for three batteries, let alone two separate chargers, and mostly by chance already have a OTG cable. SquareTrade warranties can be more or less useful and depend on personal preference. So on and so forth.

I realize it's more convenient to sell as a bundle, but unless someone just happens to be looking to go all-in, it's less convenient to buy a whole lot of things you don't need for more. An option for just the N810 and 1, maybe 2 batteries might help.