The OP was correct in their observation. I see the same thing, only a range. No indication of reimbursement and/or fee. I followed the advice here and tried to request my first shop with them. The pop up for the Sandwich Shop still only shows a range of 4 - 10. I did not finalize the request.
I find their fees incredibly low for the amount of work required. How are they about increasing the fee amounts; I would not mind doing the grocery shops, but not for $5/hour.