Sabby, lots of good points here ... I would also support the 'regular updates are better than bulk content', however you have to look at whether you have a trial, what your retention from the trial is etc.
If you have content that updates every day, you have to make sure that the customer who signed up *today* can see that you have updated X times this week ... with our celeb sites, we have an updates block on our front page of members that lists the last week of updates, and a 'more' page that catalogues every update we ever made.
I can't stress enough how important it is to present content creatively & to build 'time wasters' ... ie, turn a bunch of pics of yourself into jigsaws or, maybe with your style of site, a 'request' line ?
As for pin pointing exactly how many pics & vids ... you could justify a 'paysite' with less than 100 pics, if you presented them & priced it right. Pick up a magazine and count how many pics are in each 'spread' - its usually a 6 page spread, no more than 10 pics, and its about $5 - 7 for a magazine.
I've been working on breaking my members content into 'blocks' and converting it to ebooks -
http://www.purvette.com
1 ebook is made up of about 10 stories, the other 2 have about 15 articles in each.
Purve Models Australia has about 20 'centerfold' pics of varying sizes, 40 small pics of treasure trails and several pages made up of *survey results* ... so I guess my advice is that pretty much anything goes, you just have to market it and present it in a format punters are comfortable with.
With your content assets you've built over the years, you should have no trouble making good members areas
