To get a Honda/Toyota/Suburu/most imports up to the point where it can (and will) race with other GT cars takes alot of $$$, and I think that's the point being made. Why spend that money and labor when you can start off right from scratch with a car that will compete with the warranty voided car you've just built??
Most import cars are not built off the line for performance, not unless you start looking at the Skyline series, or a Euro WRX STi 330, 350Z, etc. With the Supra no longer in production, there went the last great GT import car imho. Everything else is tiny - You have to hop it up with ungodly mods to compete with other 'stock' GT cars offered by many other companies.
Honda does a good job at what it does best. Engines. (I think someone else said that too?) They run forever, and require little to no maintaince. Enjoy their success in the field they excel at..
I just don't get the mindset of 'buy small, build it into a beast'. In the end, you'll spend more money than if you had been patient and just started off with a good base car.. It's like the credit card epidemic in the US. 'I've got credit, lets go spend money, to hell with saving for something better, I can get XXXXXX right now!'