I rode my 71 bone stock and scruffy for years until some trouble in the left cylinder made me park it. I originally wanted to restore mine too but the cost is so high and besides, say you do restore it... then what? You park it your living room and look at it? It doesn't make sense to pay huge $$$ for the last few original parts on earth then go out and get them wet and rusty, dinged with rocks, and bleached by the sun.
I left mine sitting for years but I couldn't bring myself to sell it. Then I decided what the hell, I love the old thing, I'll put the original parts on the shelf, throw money at it and make it into something I want to ride every day again. Does it make sense? No, I'll probably break $3000 by the time I'm done and it'll never perform like a $3000 modern bike, but it's mine and I'm having fun doing it. And really, over on the ducati board they're throwing a couple grand just at their brakes so we're not the craziest inmates in the asylum.