Avira > so all the working amei haaretz have impeccable manners?
I was pondering the same question. hillel in Avos 2:6 is pretty sure that bor is not yere het and am haaretz is not chasid, a shy person can not learn and an angry person can not teach (my kids had a question on the latter – so how do we call angry teachers!?), but then a strange expression (my translation) “_not everyone_ who increases in selling becomes wiser”. It does not say – “a businessman can not be wise”. So, this seems to be saying – as you do – that while it is reasonable to presume that engaging in business will make one smarter, it is not always, especially of you overdo it. Unless, Hillel is using this for irony to mock those who think that selling is beneficial, and it went over my head. As a reference, Alter from Novordok would teach his students chochma in addition to mussar – “someone who can not buy a wagon of wood without being swindled must be lacking in his ruchniyous also”, referring to Rivka and Eliezer’s camels.
I also did not mean this as a general statement, but specifically for your situation and what you are lacking. Also, most modern jobs are close to trades than business and that is what I recommend (even as I am nominally in business, most of my day is spent on tradecraft rather than running the business). Yitzele Peterburger married his son to a daughter of a craftsman and people were appalled. He replied – if he were to mayy into a shopkeeper who possibly swindled a lot of people, this would be ok, but somehow a person whom Hashem loves for earning his bread honestly is not ok … Not sure whether this was in Yerushalaim or Kovno. And no mention of marrying into a rabbinical family either ;).