Dealers have always wanted top top book for their own stock, and your part ex or buy it is closer to scrap value, that is just the way of things with both main and independent dealers.
Dealers will always justify it with their overheads argument, which isn't helped by being billed internally by their own workshop, and parts dept, responsible for their own turnover and margins, at ridiculous rates for any efforts made in the preparation of a retail car, but as for the warranties, they cost nothing like they sell them for.
the usual arrangments and offerings are somethuing along the lines of bronze silver or gold cover warranties, and are sold in a similar grade scale, but iirc from a while ago, an aftermarket gold warranty probably cost the dealer about £200 max, and then they probably get the tax back on it too!
however, just because the dealers argument on their screen price doesn't wash with me personally, doesn't mean that privately sold cars should/could/would ask the same price and expect any success at achieving it.
most folk consider dealer prices too much for starters, so youre up against it before you start, but as a privateer without at least the option of the 150 point check, gold warranty, alfa romeo cups and posh coffee in a brand emblazoned lounge,
to put it harshly, you stand little chance!
all that said, i DO genuinely wish you all the luck in the world, for reasons that if everyone acted the same, maybe we could all get away from that historical belief that alfa's drop faster than a bomb!
perhaps a few banners, white tile the drive, a few bright red armchairs and a pot of Nescafe on the go, will help things along a tad! ha ha!
sorry to sound cynical, its just my way,
what you selling it for anyway? ha ha!!
all the best