The question of "trustworthiness" is really an open -ended matter of opinion question. I don't think any TPA is deliberately not trustworthy but with the glaringly obvious mistakes that TPAs make I don't trust them any farther than i can throw them; but yet the market is such that many people will not buy an autograph without an LOA from JSA or PSA , whether they have written that LOA for a bad/forged/non-authentic autograph.
I find LOAs give a false sense of security to the buyer ...so trustworthiness is really a matter of opinion.
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