I think energy given to this thread should be focused on different venue, like LInkedIn, as there are end users for your names, particularly when you wish you sell in higher price range.
Name like Holding / Company can realistically go for 3k-25k in 2019, imo, maybe more, but with probabilities sharply down. To say you would reject X XXX XXX kind of offers, when there are some similar alternatives to .company names ... (think of extensions like .business, .solutions, etc) ... I am not sure whether you do right thing with that.
I think you made very good investment with your 1 letter .company names, but still, if someone who is serious end user will get unrealistic quote from you for, let's say for Q / Company, they might opt to go with Q /
solutions, Q /
holdings, Q /
group or Q /
industries .. of course, they do not have exact semantic meanings, but they might be much easier to get and good alternatives to your name.
So I would say, be patient with your new gTLD holdings - If I remember correctly now they have standard renewal for .company, and it seems you have extended them until 2028, which is great...so now enjoy and wait!
Or, if you want to have some
buzz, do it on
LinkedIN - here it is not the right audience, as people who have real money and are here are experienced domain investors who buy for discounted wholesale prices, and will not pay you the desired price - and those who are not experienced usually do not have any money, so again, no use. . Imho.