Hi Ray,
Staying put has to be a good thing at the moment. I'm in just the same position here, but what if orders dropped off?? Wouldnt be fun to be stuck with a shop + rates you cant get out off without the orders to sustain it. Existing space can always be used better, and if you dont have rent to pay it makes the whole thing so much easier. To me the tipping point becomes when you need staff, at which stage you need moderately respectable premises.
Glad its going well for you,
Charlie (Equus)