It call marketing. Make things look cheaper but paying more for shipping.
I personally don't like to deal with shipping. My gas to Post Office and time is not worth making $5-10. Unless I know I will be making over $10. Let just say that if I sell plants for $4 and $6 for shipping. I make $4 and my gas cost $4. Why would I wasting my time to sale and ship things for a couple of dallors.
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If I was to be selling cheap plants I would just have a large amount. Many packages for a few bucks each and put in the post before anyone buys "won't ship til this day" that way most of it will e sold by that time and you're not making frequent trips. I'm lucky enough that the local post office is just a few minutes away but I get where you're coming from