I've had a least two opportunities to purchase a older,mid 90's,flat fairing models,

900SS(and one Tri color 750F1 O.M.G.

) which is absolutely on my short,short,short list of motorcycles I want to own.
Well,the F1 is out of reach now due to it's collector status. It was a collector out of the gate,but in years past it was an less expensive collector to buy like the E.L.R. KZ1000s were.
That being said,if I had bought either one of those machines and kept them I would not have been able to afford them. I could afford to BUY them,but I couldn't afford to OWN them.
On top of that I would not want to have one as an only bike and for the many reasons listed above in Mr. boner's reply,so you see I didn't have much choice other than hope someday I would be able to afford one as a second or even third bike. Unfortunately,that day hasn't come yet.
Ducati 900SS:
BikePics - Ducati 900 SS Home Page on BikePics.Com
Ducati 750F1:
Ducati.com
Buyer's FAQ:
Ducati Buyer's FAQ