Seriously, he's taking a big loss.
Fact: car ownership typically goes hand in hand with taking a financial loss. Cars depreciate in value, plain and simple. There are only a few exceptions to this, namely Ferraris and other rare exotics and one-offs. But these are hardly mainstream cars, unlike, say, the Ford Mustang. Investing money to upgrade a car's performance and/or styling is fine, just be aware it's unlikely you'll get that money back the day it's sold. Case in point: this 2005 Ford Mustang GT up for sale on Kijiji, aka Canada's version of Craigslist. Its owner-seller claims he invested $100,000 CAD (about $75,000 USD) in various upgrades over the years.
In fact, he claims to spent over $95,000 CAD ($71,000 USD) in labor and modifications alone. So, what are some of those mods? A Beatty and Woods-built Boss black 5.0-liter V8, aggressive blower cams, FMS CNC ported aluminum heads, DeatschWerks DW300M fuel pumps, Ford Racing radiator and fans, and a T56 Magnum XL 6-speed transmission.
Inside there's a Shelby angled gauge pod, Recaro seats, and a Ford Racing rear seat delete kit. The body is reportedly rust free with only a few dents and scratches, but it's all original paint. Total output? 631 wheel horsepower. However, this may not be fully accurate because the seller goes on to say that the "tires (were) smoking" on the dyno.
There's no doubt this is a well-constructed Mustang with a lot of heart and soul pumped in, not to mention dollars (regardless of currency). But here's the thing: the all-new 2020 Mustang Shelby GT500 costs nearly the same as what this guy invested. MSRP: $73,995. Couldn't he have just waited a few years? Of course, but everything is easier in hindsight.
It may have also been a bit wiser to buy a 2010 Shelby GT500 with 540 hp and modify it from there. But that's all in the past. Today, this guy is selling his heavily modified '05 Mustang GT for $45,000 CAD, or about $34,000 USD. Do the math and that's quite a big loss. For prospective buyers, however, it's actually a pretty decent price.