Pro BB'ers are having kids (and I'm sure they have more than the equivalent of any of our 7 cycles). There are guys on here who (atleast claim) to have had 0 sperm count while one, but after several regimened weeks of clomid therapy were able to get their sperm production up into the satisfactory range. This may be a risk you are not willing to take, but the risk is minimal (but if it happens the price you pay is high). If you are planning on starting a family I suggest you weigh the choices very heavily...