https://www.epicnpc.com/threads/s-10-l-roy-10-altina-9-b-ike-9-l-ike-x58-5.1700948/
This guy sold his account for $60 and it had a B!Ike+9 with the last dupe given out for free by completing the Hero path which is easy to do so. He also had what it looks like at least a +1 B!Lucina. But we both know that having a completed B!Ike matters more than a completed B!Lucina.
Your 4 stars promoted to 5 stars do not count as anyone can get them (as well as Tempest Keep units), and I won't bother with mentioning them and any Tier 3 and lower units that you have which are mostly +10.
Your +10 Lysithea and +10 Sothis are Tier 1 (while the previous seller has tier 2 comparable units Altina+10 and L!Roy+10) but it all comes down to B!Ike and B!Lucina for me (both Tier 1).
At the current cost of me having to pull him 10 times to be +10, it would have definitely cost me more than $60 USD and for that, I can't recommend more than $60 for your account. I would be the one spending way more than even $500 even to get B!Ike to +10 and I can't have that struggle unless the costs are reasonable. With that in mind, I can understand why you have been offered low prices before, only IF they wanted B!ike as much as I do.
Because me missing out on that previous offer for B!Ike+10 (pretty much) for $60 was such a steal, regardless of what else that account had to offer.
This is my serious answer, coming off the back of a comparable account, knowing that any future units I want are 5 stars and not 4 stars or lower, henceforth your 900k+ feathers compared to the previous seller's 155k feathers do not matter in the slightest.
I understand that you won't accept this GENUINE and calculated offer of $60 USD, but I can't offer anymore, considering B!Ike will get his resplendent unit update in 2 days time, you know how relevant he is in today's meta, given his original release date was on the 31st August 2017, which is funny considering your former Tier 1 (now Tier 4) +10 Ayra was released later on the 19th October 2017 and yet she lost her relevancy due to power-creep much earlier.
If you are up for it, I can pay you the $60. if not, then good luck. The longer you leave this, the worse power-creep gets so it's best to cut your losses a.s.a.p.