Bring a Trailer (BAT) is a good indiction of the prices these things actually sell for. Unlike eBay, they are selective on what they allow to be listed on their site, so typically there are better examples found there. The average purchase price of the 15 DeLorean's SOLD on BAT since 2016 is $40,656 (not including the hovercraft). This is with 5% buyer's fee added that BAT charges, and I will include this fee in the below analysis. Range between cheapest and most expensive sold car was $21,262-$55,125.
Now if we break it down for cars sold within the last year (Dec. 2018 - Dec. 2019), there were 8 to include a black painted one, which had the lowest selling price at $33,338, while the highest sale price for a stainless example was $55,125. I'd consider the painted car an outlier since painted cars are always worth less than an equivalent stainless car. With that removed, the average SOLD price in the last year was $45,223. Even with the painted car included the average sold price was $43,808.
Now if we break it down to "bid to" prices but not sold, there were 9 cars with an average bid to price of $29,313. These cars tended to be lesser examples that people did not pull the trigger on with a few nice exceptions. Range for bid to prices was $16,800 - $47,250.
Now if we look at all 24 auctions (excluding hover craft) on BAT since 2016 to include sold and bid to pricing, the range is $16,800 - $55,125 with an average end of auction price of $36,402 for all sold and unsold cars. Bear in mind 20 of these cars were listed between 2018-2019 with only 4 listed between 2016-2017, so the trend is that they are coming up for sale more often.
Do you know what this means? It means that this damn thing doesn't work at all!
Seriously though, the above analysis shows that auction prices on BAT are on the rise but not skyrocketing and that more cars are being listed more often.