Difficulty is always increasing. It depends on how high you think difficulty will rise in the future. This price is cheaper than Bitmain website and includes a PSU, if you have a reasonable offer, PM me (though much less than what I've posted and I will just keep mining with them tbh, I'm getting rid of them because my gf is sick of them, but I can persuade her
)
lmao...well at least your making an effort huh? She can't fault you for that!
Your price doesn't seem to unreasonable to me, you might find some interest. Good luck with your sale.