Depends what you mean by returns?
I pay £260 for 5,000 designed, printed and delivered (to areas of my choice).
I design them myself and just send the artwork (ex printer/ graphic designer)
I get 4 to 5 enquiries per thousand (so say 22 enquiries)
I'll convert 17 (17 x £19 - my house average) = £323.
In spring 3 of those custys will also want SFG cleans at £140 to £160 each.
Happy days!
The trick is to get the leaflet right, the area right, and make sure all the leaflets get delivered.
And before you ask the distribution company only operates in my local area.