Ha! Not made of money -- just been adding to the collection over many years. Sometimes I joke about my P7s being part of my retirement fund because of the way they've appreciated in price. Of the 9, the 2 Jubilee M8s (still unfired of course -- only 500 made) are may favorite in appearance. But in terms of a shooter, one of my M10s (the other is unfired) has to be my favorite -- by far one of the most accurate and mildest shooting .40s that I've ever fired.
The only thing missing from my collection is the P7K3. Doubtful if I'll ever add one due to the buffer issues with that particular model -- and the high price tag it draws due to very limited production.
The next best investment has been the P7M10 -- only 4K made it to the USA (only 1K of those were blue). The P7M13 has begun to increase significantly in value since "normal" production was ceased in 2005.
For concealed carry, I still prefer one of the P7 (PSP) models. Slightly smaller, without the heat shield, and employing a European magazine release. One of those was my first P7s -- that quickly got me hooked into the P7 cult.
Yes, they do get hot after a few magazines of ammunition fired quickly. But then, it wasn't really intended to be an extended use range gun -- rather a self defense weapon system. Even though I've used a few of them in multi-day training courses, the heat has not been a problem for me. Then again, the heating issue is a good excuse to have more than one P7! 8)