Actually, I think a bit of a relaxed attitude towards your hobby (and therefore the qualtity of your sewing) is healthy. It makes you go ahead and sew! And wear the stuff! And enjoy! I tend to look more than I should at the things I did wrong in a garment...
which, on the other hand, makes me improve. As I have improved over the last years, I shudder sometimes when even looking at cheap RTW... no, I certainly don't want it to look like that... A acquaintance of mine cut patterns and sewed like there is no tomorrow - no structure, no rules, wonky seam lines, seamallowances of different widths, slapdash sewing. But she liked and wore the stuff she sewed. She never got better and the stuff not always looked good, but that was just not the goal! So, I guess, for a hobby sewist, wonky seams once in a while are okay...
As a professional -
. If I were to sell a pattern, I would make sure to make an excellent sample. If it were a garment, I would see that the garment fits the model. A bag: Nice fabric, good topstitching. Because selling something is showtime. But then, that's me. If the person(s) selling there patterns are fine with their sample, and the pattern sells, maybe they got good value for their money (time)? They'll get some customers, they'll frighten some away.