οὐκ ἐβουλήθη (he did not choose)
εὐδαίμων γενέσθαι: is very sarcastic. The conclusion introduced by τοιγάρτοι is equally emphatic. Polus admires in Archelaus the strength of will which hesitates at nothing to accomplish its aim; regret with him is weakness.
καὶ ἴσως ἔστιν ὅστις κτἑ.: in these words, in spite of their sarcastic form, lies the only attempt at proof which Polus makes, i.e. an appeal to the opinion of others; he of course thinks that no one will own himself to be such a man.