As Liver has said i modded my car to get it the way i want to.
I generally don't keep a car more than 4-5 years so for me i mod the cars as and when i have them. It is sometimes harder to sell a car modified so returning to standard makes it easier. The dealer were going to knock £1750 off my car if i sold it to them modified due to how hard it would be for them to sell. So i returned it to standard and sold the mods that won't fit the new one for nearly £1300 (Which has been used to buy the mods sitting in my garage awaiting the new arrival ). So im actually £3k better off.
^^^X2. when I sold my Ed30 about 18 months ago, I actually sold parts for circa £1500. I mapped her for 150miles, and removed it (SC - car was awful to drive), so IMO not all mods enhance the car. we are not all the same thankfully.
The buyer did not want a modded car. One big lesson I learn't is the car without mods is a cracking car, and as a daily driver is far better as a standard car IMO for 99% of the time. VW spend a lot on development and it rightly shows.
An interesting point, is that mainstream VW dealers are getting wise to specs and Modding, when I sold my Roc R, the dealer knew the
exact spec of the car from his computer, including interior, exterior and factory options. He did not want any deviations from that spec, not even extra OEM deviations (eg C/control), so if you do Mod, keep all the old OE parts, or sell it privately to another enthusiast (hopefully) and recoup?