500 a day, means about 15000 a month. so say that even if each users comes back twice a day (not likely but still) then you have 30,000 hits and each user gets 5 PV (AGAIN not likely but lets assume that this is the case) then you get 150,000 PV. dont think thats anything special.
You can not categorize the number of visitors as good or bad..the main thing is how classified visitors those are..whether they are really interested in your services or not..if you are getting per day 10000 traffic but none of them is interested in your services, then how good that traffic would be??
It all depends on what type of website you have. Traffic is difficult to interpret, unique is sometimes not as important as return visitors....
If you find $30 is enough to make from your site in a month, then it's enough visitors.... If not, then the sky is the limit!