Why do we buy compost?

I have always bought compost for seeds and seedlings because it was sterile: no weed seeds and no nasty bugs.

The current peat-free stuff is still often free of weeds, but it comes with free fungus gnats, needs seiving, needs modification to get the moisture retention right, often needs added fertilizer... and the seeds still often either rot or damp off. Even so-called "John Innes" is poor now that it uses peat substitutes.

I can see me using less and less as time goes on and as I get more diligent in my compost and leaf mould making. I won't be hot composting, so there will be weed seeds in there; but for sowning large seeds and for pricking out / potting on I hope to be self sufficient. So one bag of seed compost a year will hopefully do me.