Well, I find that 70% of people who come to this site are new visitors. This suggests that most people never come back. If we can generate some revenue from them, it can only help the coffers of Access World and so therefore the future potential of this site.
I do have concerns about it being off-putting for new visitors, but its only the start. We are going to be having more adverts, some of which existing members will also see. However, the newer ads will not be as intrusive as those in-your-face ones that guests see.
Note that to the right of the advert is a Registration notice that will hopefully encourage more people to become a member here. Its much more prominent and who knows, it might help membership numbers.