papa posted some numbers but they don't mean much. while some sites keep your sites listed forever and they will send you steady amounts of traffic each month (and the number is only getting higher the more sites you submit, adding up to a huge amount each month), while others, tho they may send you more hits straight away quickly drop your site or bury it under thick layers of archive pages (so as soon as you stopped submitting, you get pretty much 0 traffic) - if papa stopped submitting for a month and posted his stats again, you would see almost no change in traffic for some of the names on that list, while most would plummet.
and while fishing for info on the forum on who is worth submitting to and who isn't, you really need to submit in order to figure out who's worth submitting to, depending what type of sites you build and what niches you build them for. Because (and this brings me to my second point which probably is even more important) not all traffic is the same! No point getting into details on this one since you can probably figure it out on your own but if you can't, contact me I'll explain
