I am involved in one like you say
XXX Shed and unless you get some traffic from your sources it is going to cost a bit through Adwords, advertising etc
I started a more mainstream one (as per sig) and do little advertising and this moves slow but is picking up!
Dont let ony one tell you not to but you have to weigh your options up in relation to a profit/loss scenareo!
Good luck if you choose to undertake such a project
