Difference between cheap and expensive sellers

I’ve bought many shirts off different websites. I’m going to do a haul, what is the different between cheap and expensive sellers? Expensive isn’t actually expensive btw, it’s all affordable and the ones that are higher price are likely drop shipping. But peterbot, bestzv messi100 can all offer lower prices than Jeofc, laboin, mmjerseys

To me I always think they get them from the same supplier but after reading lots of reviews from different suppliers I’m not too sure!

Also let me know your experiences with Peter bot, as im considering ordering off him!