considering starting a service, tell me what you think

I'm considering starting a new directory submission service which would offer the following.

Manual directory submissions, submitted monthly. The directories would all be PR3+

5/month for 12 months 12$
10/month for 12 months 24$
15/month for 12 months 36$
20/month for 12 months 48$
25/month for 12 months 60$
30/month for 12 months 70$
35/month for 12 months 80$
40/month for 12 months 90$
50/month for 12 months 100$

All directories PR3 and above, do you guys think that people would be interested in a service such as this, for these prices?

 

I'm confused. Why would I want them submitted monthly, instead of all at once?

 

500 links at a time isnt generally a great thing, spreading your link building out is generally considered better.

 

really depends on quality of directories and relevance to site. can you target a specific industry?