That's your view buddy and not a view I share. I'm not after an IS-F or an IS350. If i was, I would have bought one. I'm not modding my IS250 because I want it to look like an IS-F, if that was the case I would have got the full IS-F bodykit. I liked the rear-end of the IS-F when it came out and that's when and why I only did the rear-end conversion back then. I've owned my IS250 since it was 12 months old, I am happy with it and have been spending money on it gradually, nothing that kills the bank. I also have a 2013 RX450h.
I mod for my own pleasure, not for resale value. A car is always depreciating, unless it's a classic or antique. I didn't buy it back in 2007 with the thought of selling it in mind. The pleasure and satisfaction of the comments I get on the road wherever I go is way worth the effort and money. For me modding is not only creating something to my own taste but also a huge learning platform. I cannot emphasize enough how much knowledge i've gained from modding. This in itself is invaluable and only experience can make you better at what you do (practice makes perfect). I haven't just been modding my Lexus, past few years i've been busy working with "RenaultSport" cars and have been selling a custom made product by me to customers worldwide (mainly Australia, Singapore, Spain, France, Malaysia and UK) Through this I made a profit in the region of £35,000 in a span of 8 months. I see that as an achievement and would not have been possible without the continuous trial and errors of modding.
Furthermore, I've also been approached by "Internet Brands, Inc." (The company that runs ClubLexus) to write how-to articles on my mods for a new how-to platform they are launching. This is something i have done and been paid for each article. Being asked to write paid articles for Internet Brands was a pleasure and gave me great satisfaction. This achievement is invaluable to me and was through all the exposure I got through my published mods.