I think it is okay to restore a bike, as long as it is not what I call over-restored.
I do not believe in blasting aluminum castings or much else for that matter, it destroys the as-cast look. I do not believe in powder-coat or clear-coat paint. I don't believe in polishing parts that were not polished when new.
At this late date a lot of history has been lost or is hard to find, so I think about if I am destroying any history. I want to ride a vintage bike so I can get a vintage experience. I want to know what it was like to ride a bike in the era in which it was built. I don't get the people who get a vintage bike, then throw away all the parts that they don't want to work on and replace them with modern parts. I want a magneto with points, Amal carbs and drum brakes and a chain primary.
If someone can restore a bike and I can not tell that it was restored, but just looks like a well maintained original, then I can not imagine them doing any better job than that.
I am far from a wealthy man, lower middle class actually. I can not afford new chrome or any other paid for restoration processes. I have to do everything in my one-car garage when it is above 50 degrees outside or it is probably not going to get done. But that is okay with me. As long as I can have a bike to ride, as long as I can take part in preserving the history of motorcycling for someone in the future then I am happy.
My 62' 650ss was half apart when I got it a bit over 20 years ago, luckily it came with it's original major parts. I just did enough to it to get it on the road and I kept it as original as possible so others could see what one looked like back in the day. I will never win any trophy at a show, but I saved the bike from a sketchy future, others may have parted it out or made it into a Triton etc.. I knew it was a rare machine though and I kept it in mothballs until I had the time to put it together. I am pretty sure a bit less than 2000 650ss bikes were made in 1962, so it is a shame not to try to keep them in one piece.
This ends up being a problem in a way. I do love altering bikes for extra speed, but if you have a pre-Atlas Norton with matching numbers then it is almost an obligation to preserve it. So I would like to find an orphan frame to build a racer out of, so I would not destroy any history.
I have eight featherbed Nortons that are 500-650cc, and they all have matching numbers or special enough histories to warrant keeping them original as I can. It is not my right to destroy them after they have survived half a century+. I am just a caretaker of a museum of sorts until I go tits up and they go to the next hopefully good home.
A 1962 works Daytona 88 racer with original paint on the tank, never restored just kept race ready the last 51 years by my deceased friend Heinz Kegler, one of three: