Advice to eBay Sellers

I picked up a few random cards from 2013 Topps from three different sellers on eBay.  The cards cost less than 50 cents in total.  However, each of the three sellers shipped the cards to me without a penny sleeve, top loader, or any other protection inside of a bubble mailer.  That is a strange and dangerous way to ship baseball cards.  As luck would have it, all 7 cards arrived in great condition.  The Cahill card looks slightly twisted, but there is no crease so I can fix it.  I got lucky this time.  But would it kill eBay sellers to use a penny sleeve every now and then?