COuld be. I gave 50K as a "devil's advocate" number, the actual numbers would probably be more around 10-20K (without knowing the company's specifics, it could be much higher, but not lower, as it's not a social networking site). However, 1/4 of them being potential customers is way too optimistic. Even for sites geared specifically for selling something (so people only visit them to buy something, you'd think), the conversion rates are still below 10%, and it goes further down if the site has interesting info on it, as then more poeple come there for that info (the thinking is that some of them might convert). Still, I was only commenting on the ad part, don't know anything about this company.
The usuals, whatever I post is my opinion, yaddayaddayadda. I'm still learning this, so if you listen to me, well, good luck to you :)