This was never about me.
Rather than being pedantic over a choice of term, why don't you validate for the OP that he can actually roll his own potting mix *cheaply*? You've now replied twice regarding the use of a word, and persisted in your quest to be right... But the entire substance of your previous post was just to tell him what not to do, in the vaguest of possible terms.
Why don't you support your assertion (of not "going cheap") with some sort of example, so the rest of us can make some sense of your perspective? It's possible that this is a new grower, who doesn't have the luxury of taking for granted what is "cheap", or "inexpensive", or whatever other synonym we've failed to add to the lingo matrix.
Based on your previous comment, the only conclusion that I can draw, is that unless something costs some arbitrary amount - which isn't inexpensive - it's a waste of time.