Oh I SOOOOOOOOOOOOOOOOOOO adore Sugar And Spike. And I'm so proud of having a number one. It just never never never comes up for sale. I've seen one on e-Bay in four years. I tried to buy it as a spare, but there were about ninety bids on it.
A full set of all ninety nine issues is nigh on impossible. Paul Levitz thought number 2 was the rarest DC.
I saw two Sugar and Spike #1's at San Diego last week. But I do agree, it would be a very tough set to complete.
With enough money, no set is hard to complete.
I would agree that in most cases that is true, but there are some sets were individual issues (regardless of value) just do not come up for sale. You do not see many single digit issues of Sugar and Spike for sale often. Look at one of the last books Ian needed, a Buzzy 70. Money didn't make that book more accesible, just time and perserverance.