How Many Affiliates Do You Get From Networks?

I am setting up an affiliate program for my main site and due to the fact that I am using 3 shopping carts on the same site to handle GBP, USD & EUR without converting to a base currency so I am going to use a third party network.

I know that once I choose I will be tied in as moving affiliates from one network to another will be problematic, so I want to choose the right one.

My question though is how many affiliates can I expect to pick up (assuming my product is good and competitive - which it is) just from being listed on the affiliate network?

If the answer is that I probably wont pick up many affiliates just browsing the network then I will go with the network whose system and support I like best.

If I can expect to pick up lots of affiliates just by joining a network then I want to make sure I choose the network that will get me the most affiliates.

Right now I really like Shareasale. Their support was really responsive and knowledgeable when I asked them some technical questions and got back to me right away. The majority of other networks I talked to didn't even bother responding.

Can anyone share their experiences of listing the site of a network and having new affiliates join their program?

Many thanks in advance.