Here are a couple of key pointers to follow to ensure the value outweighs the cost: Educate Yourself on Grading The difference in value between a PSA 9 and a 10 can be huge
Wildcards can be obtained in booster packs, and are available in all rarities: common, uncommon, rare, and mythic rare
Then the collection gave you useful information
We also buy really large collections: If the value of your collection exceeds 20,000, we will look for an individual solution with you, for example we will be happy to come to you or you can come to Vienna at our expense
Mint and near-mint cards pull the strongest offers
If that's not cutting-edge Magic theory, I don't know what is