Stamps are much, much more complicated than that....straight edges, imperfs, reperfs, regummed, postmarks removed, postmarks added, etc. So much has been done to them in the last 100 years it makes the current baseball scandal pale in comparison.
There are paper people, some good, some bad, that are so skilled that you could cut a rare stamp in half, they could put it back together and it would be virtually undectable to the naked eye, although a quick dip in fluid will reveal most modifications.
PCGS has had it issues with slabbed gold coins that were laser enhanced to bump a few points, it took several dealers, experts and law agencies to sort all that out several years ago.
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