That's looking at it very optimistically.
Sure you can get cost price of items right down, but it's the labour and organising which takes time.
If you are doing it yourself, you need to prepare for slab.
Prepare formwork (need materials and tools for this).
Pour slab, need tools for this, and you need let it cure, so can't do the shed yet.
Assemble shed.
Dispose of all rubbish and clean site.
I think it would be more than a "few hours" of labour all up.
If buying from a business, they have to cover overheads, marketing, warranty issues, etc, which all adds to the costs.
I think $2000 would be a reasonable price (Sydney), WA is probably more expensive.
Bugger all rubbish to take away....most can be reused again regarding any form work timber or steel...
So whats needed: Edger, trowel, screed, level....most blokes who are handy would already have those...plus a hammer, few dyna bolts and a rivet gun....oh! and a lunch box with sangas and drinks!!
This is allowing for a two day job, waiting for concrete to cure...but you would have several jobs going at once so wouldnt be an issue really...
shed say $200 which the cheapies are wholesale
mesch: $25
Concrete: $200 (generous)
Extras: Dyna bolts, rivets, fuel etc $20
Max all up well under $500 smackers....
Lay concrete max two hours tops if you use hurry up in the concrete mix
Whats a bit of time cost?
2700.00 minus say 500 leaves $2200...so a third for you, a third for me and a third for the business.
Say 7 sheds a week which could be done very easily thats $15400 gross a week...
Damm nice easy earner if you can get it...
Couldn't do that where I live i dont think but a capital city with good marketing that is easily achieved I feel...