I too had the same concern when buying used records with serious surface noise, even after thorough cleaning. From what I was told by those in the know, the groove damage from cheap styli itself should not damage the stylus. As long as the record is clean and doesn't have more serious defects such as deep scratches or chips, it should only have a detrimental effect on the sound, not the stylus. My advice would be to examine each record and make sure it does not have visible damage that could conceivably hurt the stylus.
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