Speaking in more general terms than profit/loss, if I were in the same position, I'd aim to encourage a community of cyclists around the bike shop, weekend/weeknight rides, accommodating for novices, be generally the best and most helpful shop going, nice place to be, get a good rep with local clubs. Hopefully word of mouth will then do some of the advertising for them. The shop I use is local to my work and the main 'sales' guy there is always the most friendly, helpful guy, happy to chat about bike stuff and generally a nice chap. Always happy to give them my trade.
In my experience, cycling club members are usually the tightest customers unfortunately, always after discounts, and far too 'clued up' from all the forums/internet research/cycling friends etc to take sound advice from lowly shop workers
Speaking in more general terms than profit/loss, if I were in the same position, I'd aim to encourage a community of cyclists around the bike shop, weekend/weeknight rides, accommodating for novices, be generally the best and most helpful shop going, nice place to be, get a good rep with local clubs. Hopefully word of mouth will then do some of the advertising for them. The shop I use is local to my work and the main 'sales' guy there is always the most friendly, helpful guy, happy to chat about bike stuff and generally a nice chap. Always happy to give them my trade.