Forum Moderators: not2easy
There are now so many press release sites, that the early advantages of having a site populated by content freely donated content, have been seriously diluted.
There may still be room for some niche sites (usually is!), but you need to check out the competition. Adding yet another outlet to a crowded market just means more confusion among release witers, further division of available adsense income, and more duplicate clone pages in Google. No-ne really gains by simple duplication.
Sorry to be so pessimistic, but I suggest you've arrived a little late to that particular party.
If your service is in a particular niche, perhaps you can market better to the key players (who may not be doing electronic releases yet), or develop a very good list of media individuals specializing in that topic. By catering to both ends of the process, you may be able to do a better job than a general agency.
Best regards and good luck.