Ok so I have some ideas and my friend is an artist so how would we both submit one design? For example two people submitted "House Salad"

Why are there T-Shirts get printed when they get quite a lower score? When there are ones out there that get close to 3 and still are not printed?

Who ultimately decides which ones get printed and is there even any point in scoring submissions when it seems like the score doesn't matter in the end?